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Tongue rolling pedigree

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Schauen Sie sich unsere breite Palette an Pedigree Produkten an. Eine gute Wahl für eine ausgewogene tägliche Ernährun Aktuelle Preise für Produkte vergleichen! Heute bestellen, versandkostenfrei The ability to roll your tongue is caused by a dominant gene (R). If you can't roll your tongue, you are a non-roller and must be homozygous recessive (rr). + + + + + + + + + + A father cannot roll his tongue but a mother can This is an image of a pedigree displaying tongue rolling within a family over 3 generations. As we know, males are represented by squares, females by circles and those whom are shaded are known to be affected; in this instance, affected refers to individuals who can roll their tongues Reader view Tongue rolling is the ability to roll the lateral edges of the tongue upwards into a tube. The intrinsic muscles allow some people to form their tongues into specific shapes. Popular belief holds that variation in this ability is the result of genetic inheritance

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Drag-and-Drop Pedigree 1: Tongue Rollin

In humans, tongue rolling is caused by a dominant autosomal allele. This pedigree shows three generations of a family and their ability to roll their tongues. Which phenotype best describes individual III-8 Select a family with anyone of the monogenic traits like rolling of tongue, blood groups, ear lobes, widow's peak and colour blindness. Ask the person exhibiting the trait as to who in his/ her family has the trait in question. Prepare a pedigree chart on the basis of the information collected, using appropriate symbols This video demonstrates how to use the Hardy-Weinberg equation to calculate genetic frequencies of inheritance.This video was produced as part of a student p..

The proportion of people who can roll their tongue ranges from 65 to 81 percent, with a slightly higher proportion of tongue-rollers in females than in males (Sturtevant 1940, Urbanowski and Wilson 1947, Liu and Hsu 1949, Komai 1951, Lee 1955) Pedigrees Ability to roll a person's tongue in a U shape is an autosomal, not sex-linked trait. On the pedigree above, individuals who cannot roll their tongue are shaded. Being able to roll the tongue i Tongue-rolling isn't the only genetic trait we've oversimplified. Here, a few other examples McDonald says he's debunked. 1. Hand-clasping. The myth: Whether you put your left thumb on top or. how can you account for the differences between carriers in tongue-rolling vs. hemophilia pedigree? autosomal traits are not found on the sex chromosomes so there are no differences based on gender in who expresses a trait. hemophilia and other sex-linked diseases are found on the x-chromosome. because men only inherit one x chromosome, if they. Rolling the tongue into a tube shape is often described as a dominant trait with simple Mendelian inheritance, and it is not referenced as introductory and genetic biology courses. There is little laboratory evidence supporting the hypothesis that tongue rolling is inheritable and dominant

tongue rolling is a genetically controlled trait Stock

Pedigree - DN

IV. Each pedigree should be on an 8.5 x 11 in. piece of paper. V. Each pedigree should have a key; use appropriate pedigree symbols. Also note for each individual: A. Genotype (when able) B. Phenotype C. Name of relative List of possible traits: (choose four) Tongue rolling (RR or Rr = roller, rr = non-roller The term tongue twisting comprises rolling, folding, rotating, adjusting, and turning of the tongue. The human tongue is a muscular organ that is capable of identifying the taste of food and is.

Dana's Family pedigree on tongue rolling by Dana Abu

It was the leading geneticist Alfred Sturtevant who suggested back in 1940 that tongue-rolling was a Mendelian trait, meaning that it was inherited not as a blend of your parents' genes, but from.. PEDIGREE CHARTS A family history of a genetic condition Quick Review Genotype = what genes someone has Genes are usually represented by a letter, a capital letter for the dominant trait, a small case for the recessive. Example: Tongue Rolling is dominant, so we use R to represent the tongue rolling Inablility to roll your tongue is recessive so. AUDIO: Creating The Example Pedigree. The gadget spec URL could not be found. If you would like to have a text copy of the audio steps describing how to create this sample pedigree, download it from the file (Text_Creating_The_Sample_Tongue_Rolling_Pedigree.docx) at the bottom of this page. Č

Tongue rolling pedigree chart Science ShowM

  1. ant gene in the space below your symbol on the pedigree. 5. If you are constructing a pedigree for your own family, survey additional members.
  2. ant (E) and light eyes (such as blue or grey) is recessive (e). A father and a mother both have brown eyes. Their two sons have blue eyes and their two daughters have brown eyes. One daughter carries the gene for blue eyes, the other doesn't
  3. Debunking the biggest genetic myth of the human tongue. Science Aug 5, 2015 5:22 PM EDT. Roll it, flip it, fold it and even mold it into a squiggle. Your tongue can be an acrobat, regardless of.
  4. ant trait, a small case for the recessive. Example: Tongue Rolling is do
  5. Kostenlose Lieferung möglic
  6. ant trait, while the inability to roll your tongue is a recessive trait. • Eye Color: Shades of brown or black are do

Tongue Rolling. Click on Tongue Rolling. Give the genotypes for these phenotypes. Homozygous Tongue Roller: _____ Heterozygous Tongue Roller _____ Homozygous Non-Tongue Roller _____ Recreate the pedigree that you have made: What percentage of the offspring were homozygous non-rollers? _____ What percentage of the offspring were heterozygous. members for tongue rolling and find out that 2 or 3 family members are non-tongue rollers while the rest are tongue rollers. Non-tongue rolling would be a good trait to use for the pedigree. On the other hand, if everyone in your extended family can roll their tongue, then that would not be a good trait to use Tongue Rolling. Attempt to roll your tongue into a U-shape, in which the sides of your tongue are curled upwards. Tongue rollers carry a dominant gene R. Non-tongue rollers are homozygous recessive (rr). Widow's Peak. A dominant gene W causes the hairline to form a distinct downward point in the center of the forehead Studying human genetics Symbols used in pedigree charts Organising the pedigree chart Organising the pedigree chart Organising the pedigree chart Tongue rolling Slide 9 Tongue rolling Tongue rolling Tongue rolling Tongue rolling Tongue rolling Tongue rolling Tongue rolling Albinism Albinism Albinism - a recessive condition Polydactyly Dominant. Simple Human Pedigree Analysis Tongue Rolling Dominant = can roll tongue Recessive = Flat tongue Earlobes Dominant = detached earlobes Recessive = attached earlobes Earbump Often called Darwin's Ear Bump Dominant - Having a small bump on the ear Recessive - Not having the bump Widow's Peak Dominant = widow's peak Recessive = straight hairline Hitchhiker's Thumb Dominant Recessive.

Tongue-Rolling: Rolling up edges (dominant trait) vs not rolling (recessive). 30. Try this pedigree out. It involves two families and tongue rolling: (R=dominant, a roller; r=recessive, non-roller). On the next page, fill out the pedigree and in each shape, list the genotype of each individual. Narly Story Fred Narly, a tongue roller, broke with family tradition and married a non-tongue rolling person, Joan Fool in 1944 In humans, tongue rolling is caused by a dominant autosomal allele. This pedigree shows three generations of a family and their ability to roll their tongues. Which phenotype best describes individual III-7? answer choices . homozygous tongue rolling male.. Komai, T. 1951. Notes on lingual gymnastics. Frequency of tongue rollers and pedigrees of tied tongues in Japan. Journal of Heredity 42: 293-297. Martin, N. G. 1975. No evidence for a genetic basis of tongue rolling or hand clasping. Journal of Heredity 66: 179-180. Matlock, P. 1952. Identical twins discordant in tongue-rolling. Journal of.

Tongue Rolling Pedigree Use the following symbols to represent the members of your family. Write the names of the person below the square or circle. Boys / Males Girls / Females Robert Jane Start with the older people in your family. If they have children draw a line between the male and female that had the children Pedigree. How to interpret a pedigree chart. Males will always be squares and females will always be circles. If the square is shaded in, then it represents an affected male. If a circle is shaded in, then it represents an affected female. Clear circles and clear squares will be normal, or not affected. -First thing you need to do, is determine.

Non-tongue roller Tongue roller Figure 3 3. If you cannot roll your tongue, enter the genotype rr in the space below your symbol on the pedigree. 4. If you can roll your tongue, enter the genotype R _ for the presence of the dominant gene in the space below your symbol on the pedigree. 5 What is a pedigree? A pedigree is a diagram of family relationships that uses symbols to represent the people and lines to represent genetic relationships. (heterozygous for tongue rolling) x tt (cannot roll tongue) Genotype: 50% Tt, 50% tt 1:1. Phenotype: 50% roll tongue, 50% cannot roll tongue 1:1. T. t. t. Tt. tt. t. Tt. tt. Dihybrid. Get a quick overview of Introduction to Pedigree Analysis from Pedigree Analysis and Advanced Knowledge of Pedigree Analysis in just 3 minutes. Rolling the tongue is a dominant trait. Bella has received a recessive trait and that's why she is unable to do so Tongue rolling ability may be due to a single gene with the ability to roll the tongue a dominant trait and the lack of tongue rolling ability a recessive trait. However, there is some question about the inheritance . of tongue rolling. Recent studies have shown that around 30% of identical twins do not share the trait Each pedigree should be on an 8.5 x 11 in. piece of paper (no bigger). Each pedigree should have a key; use appropriate pedigree symbols. Also note for each individual: Genotype (when able) Phenotype . Name of relative. List of possible traits: (choose four) Tongue rolling (RR or Rr = roller, rr = non-roller

Tongue rolling is a dominant trait. Can a husband and wife who cannot roll their tongues produce a child who can roll his/her tongue? 6. Assuming complete dominance will occur, the offspring of the cross Aa x Aa will show a phenotypic ratio of _____. 7. At a gene location on a human chromosome, a dominant allele controls tongue-rolling ability Trait Ris the Mendelian trait in humans for tongue rolling. The allele for the ability to roll the tongue (R) is dominant over the allele for the inability to roll the tongue A B D G Complete the following chart using the pedigree diagram. Person Genotype Phenotype А B С D E Complete the following chart using the pedigree diagram AIM:- TO STUDY THE PREPARED PEDIGREE CHARTS OF GENETIC TRAITS SUCH AS ROLLING OF TONGUE, BLOOD GROUPS, WIDOW'S PEAK, COLOUR BLINDNESS etc. REQUIREMENTS:-Prepared pedigree chart of the genetic traits. PROCEDURE:-Observe the prepared pedigree charts and write the comment on it Drag and Drop Pedigree Activity. Both counselors are now asked to work together to construct a pedigree according to how the questions are asked. I know it's 11th grade work but just because you're a 9th grader doesn't mean that you are not up to the task. Genetic Counselor #1: will work on Tongue Rolling. Genetic Counselor #2: will work.

Tongue Rolling Pedigree by Billy Heinbach - Prez

what_are_the_patterns_in_how_traits_are_inherited.pdf: File Size: 2629 kb: File Type: pd Genetic Pedigree Project. This project is designed to continue your understanding of inheritance patterns of autosomal recessive alleles and using pedigrees - or tracing traits through a family. As in most of Biology class, the things we learn about DO have something to do with the real world. As such, you are being asked to construct a. 3. (13 points) This pedigree traces tongue rolling in a family. The ability to roll your tongue is controlled by a dominant allele; people with the recessive allele can not roll their tongue. Shaded individuals can roll their tongue. Identify the genotypes of all the people shown in this pedigree Aug 23, 2016 - This free, printable pedigree chart is great for genealogists and family tree projects. It tracks the descendants of one couple, including their children, the child's spouse and grandchildren. Males are represented with squares and females with circles. A key at the bottom helps define genetic traits, marriage and death. Free to download and prin A heterozygous male for tongue rolling marries a homozygous recessive female. Complete a Punnett square to show their possible offspring. Analyse your results as percentages and proportions. [6 marks

Can You Roll Your Tongue? Pedigree Practice - Extreme Biolog

  1. ant traits are shaded in. So we know that the circle is female. The square is male. The shaded would be do
  2. ant trait. A female with the ability to roll her tongue marries a man who cannot. The probability that your children will be able to roll their tongues is: a. 0
  3. Four pedigree designs will be prepared of your family's genetics. You will construct the pedigree representing two, three, or four generations. The traits that you will follow are: ear lobe attachments, tongue rolling, hitchhiker's thumb, and mid-digital hair. Begin at the bottom of the pedigree design with you and your genetic brothers and.
  4. Why is the character for tongue rolling given a capital letter rather than the character for inability to roll the tongue. Use the information from the diagram in your answer. The eight items below are based on the pedigree diagram that shows the phenotypes of offspring from wavy-haired parents. Write down the letters A, B, C or D according.
  5. utes) Students interpret the Punnett square showing the mating of Dad and Mom (both Rr for tongue rolling). 1

What Does the Research Say? Powell and Whitney (1937) published a pedigree that supported the hypothesis that ear lobe attachment's inheritance was autosomal dominance.Their research looked into one family for three successive generations. Wiener (1937) responded to Powell and Whitney (1937) by pointing out that the arbitrary classification into two sharply defined types...gives a false. A pedigree not only allows a geneticist to understand the past, but it helps to predict the occurrence of a trait in future generations. If a wooly hair grandson marries a normal hair woman and they plan on having three children, the probability that all three children will have wooly hair is 1 / 8 Tongue Rolling. Suppose the characteristic of tongue rolling is found on chromosome #8. Genotype - The genetic constitution of an individual organism. Two alleles exist of tongue rolling (R and r) R is the allele that codes for a protein that allows you to roll your tongue. r is the allele that codes for a protein that does not allow you to. Organising the pedigree chart ¢ ¢ Individuals in each generation are identified by Arabic numerals numbered from the left Therefore the affected individuals are II 3, IV 2 and IV 3. I II IV. Some pedigree terms to know. Autosomal recessive: Involves a recessive allele on a non-sex chromosome. ¢ Autosomal Dominant: Involves a dominant allele. Trait ris the mendelian trait in humans for tongue rolling. Pedigree analysis questions and answers pdf. Source: mychaume.com. free book pedigree analysis activity answers pdf book is the book you are looking for, by download pdf pedigree analysis genetics bio lab answers this is likewise one of the factors by obtaining the soft documents of.

Mayze's Bio Blog: Mendilian Genetics, or, Why I Can't Curl

Pedigree for determining probability of exhibiting sex linked recessive trait. AP.BIO: IST‑1 (EU), IST‑1.J (LO), IST‑1.J.2 (EK) Google Classroom Facebook Twitter. Email. Pedigrees. Pedigrees. Pedigree for determining probability of exhibiting sex linked recessive trait. This is the currently selected item Created Date: 2/14/2018 3:33:56 P

  1. ant.
  2. Go back to the song and try to create the pedigree that fits with the family tree described in the song. Once you have gotten the hang of reading pedigrees, make sure you have: - completed your own family pedigree for tongue rolling and turn it in to your teacher (note the due date for this assignment) an
  3. AP Bio Pedigree Project. Now that you understand how to draw and analyze a basic genetic pedigree. You will use this information to draw your own family pedigree using the following guidelines. A pedigree is a family tree that shows the relationships among family members and traces a specific genetic trait within the family
  4. A pedigree is a systematic listing (either as words or symbols) of the ancestors of a given individual or it may be the family tree for a number of individuals. phenylketonuria, sickle cell anaemia attached ear lobes, tongue rolling etc. Pedigree chart and symbols :.
  5. Deinert, Donna. Genetics Project. Genetics is the study of the mechanisms of heredity. Stated another way, it is the study of the ways traits or characteristics are passed on from generation to generation. People differ from each other in the expression of these traits; thus, expressing their own individuality and uniqueness
  6. e the frequency in your population by dividing the number of non-tasters by the total number. That is the value for q 2 . 4. Calculate q (the frequency of the recessive allele) by taking the square root. 5. The frequency of the do

This pedigree traces tongue rolling in a family

Pedigree: In a pedigree, squares represent males and circles represent females. Horizontal lines connecting males and females represent mating, and vertical lines extending downward from a couple indicate their children. Tongue-rolling - The ability to roll the tongue into a U-shape is not characteristic of all people. Individuals who. A web-based bookmarks manager, iKeepBookmarks.com allows you to upload and keep, your bookmarks on the web. Then you can access your favorites links at any time, from any computer... anywhere! Share, exchange links with your friends, students, colleagues. Searchengine for searching other's public favorites, popup feature, 5 different languages, free service, membership benefits Tongue Rolling The ability to roll your tongue (see diagram below), is the result of a dominant gene. If you cannot roll your tongue you carry the recessive trait. Rolled A pedigree is a chart which shows the pattern of inheritance for a particular condition by mapping the matings and their offspring. A pedigree Ex. Tongue Rolling is dominant, so we use R to represent the tongue rolling. Inablilty to roll your tongue is recessive so we use r to represent the non-rolling gene. For every trait, you get a gene from each parent Making a Pedigree Chart. Pedigree charts are made to chart family history and see how traits are passed. What generations are. Making a Pedigree Chart A family history of a genetic condition Example: Tongue Rolling is dominant, so we use R to represent the tongue rolling Inablility to roll your tongue is recessive so we use r to represent the non-rolling gene For every trait, you get a gene from each parent Genotypes and Phenotypes Mom and Dad are Rr-that is their.

Tongue roller (R/r) Dominant allele allows you to roll your tongue: Free ear lobes (E/e) Alfred is heterozygous for tongue rolling and has five fingers. Alfreda, his wife, cannot roll her tongue and is heterozygous for polydactyly. Part 4: Pedigree Analysis The tongue rolling myth goes back to the 1940s when geneticist Alfred Sturtevant claimed tongue acrobatic ability was the result of a dominant gene. Though he was disproven 12 years later, this little fact continues to make its way into science classes across the country. The proposed heredity of Sturtevant's non-existent gene hitchhiker's thumb (a), tongue rolling (b), and attached earlobes (c). There are more than 7 billion people in the world, and almost everyone looks at least slightly different from everyone else. How is this amount of variation possible? With the exception of identical twins, the gene combinations we receive from our parents vary from sibling. Tongue rolling: A dominant allele enables some people to roll their tongues into a distinct U-shape. (Recent studies have shown this tongue-rolling could be dependent on multiple genes) Widow's peak: A dominant allele causes the hairline to form a V-shaped point in the middle of the forehead. A person who is homozygous recessive has a.

*Tongue rolling *PTC tasting *Face freckles *Darwin's ears *Any other trait that you are aware of or that you would like to track Answer the following questions after you have found your family's pedigree: 1- Possible genotype of each family member 2- Explanatory hypothesis of you, other family members and your future descendant Use T to represent the character for tongue rolling and t for the inability to roll a tongue. Use a genetic crossing to supply the genotypes of the parents, Bongani and Qawekazi. Show all your working. (6) Answers Exam Questions Question 1 1.1.1 In a heterozygous condition the dominant allele expresses. Get a quick overview of Introduction to Pedigree Analysis from Advanced Knowledge of Pedigree Analysis and Pedigree Analysis in just 3 minutes. Rolling the tongue is a dominant trait. Bella has received a recessive trait and that's why she is unable to do so The ability to roll your tongue is dominant to not being able to roll your tongue. Draw a pedigree to show the inheritance of this trait, given the following family history: Grandpa Snow is a tongue roller but Grandma Snow is not. They have four children (2 sons and 2 daughters) who are all rollers. Their last daughter, Judy, married John Flake Interpret a pedigree. Determine human genetic disorders that are caused by inheri-tance of recessive alleles. Predict how a human trait can be determined by a simple dominant allele. Vocabulary pedigree carrier fetus 121. Mendelian Inheritance of Human Traits Tongue rolling (above) and widow's peak hairline (inset) Figure 12.1 Geneticists use.

Chromosomal Genetics 2 Genetics - Quiziz

  1. ant for Widow's peak and heterozygous for tongue rolling? (Fill in the Punnett Square and the blanks). Parents' genotypes Label the genotypes of as many individuals in the pedigree as possible. 3. Shade in half of the symbol if you know that the individual is heterozygous or a carier.
  2. ant or recessive? • What is the probability that child will be able to roll their tongue? produce only the best livestock and grains.??? Designer Genes •Selective breeding in plants and animals has occurred since the beginning of civilization
  3. Pedigrees show how a single heritable trait runs through generations. Pedigree PunnettSquares. Punnett Squares The outside of a PunnettSquare tongue rolling (Tt) with a female that is homozygous recessive (tt) T t t t Genotypic ratio: _____ TT : Tt : tt Phenotypic ratio: _____.
Inheritance - Megan Czarnecki's Biology Study Methods

Prepare and Study the Pedigree Charts of the Genetic Trait

Tongue Rolling. If you are able to raise the sides of your tongue together, then you have inherited the dominant gene. Those who are unable to do this have the recessive tongue rolling gene. 6. Cleft Chin. Individuals with a cleft chin have a dominant gene while those who do not have a recessive gene The ability to roll your tongue is determined by the dominant gene (T). In the following pedigree, affected individuals can roll their tongue Each pedigree should be on an 8.5 x 11 in. piece of paper. Each pedigree should have a key; use appropriate pedigree symbols. Also note for each individual: A. Genotype (when able) B. Phenotype . C. Name of relative. List of possible traits: (choose three) Tongue rolling (RR or Rr = roller, rr = non-roller In humans tongue rolling is dominant to the inability to tongue roll. If a heterozygous tongue roller and a non-tongue roller have a child, the chances are 50% that the child will be a non-tongue roller. Original pairing: Heterozygous tongue roller = Tt Non-tongue roller must be = tt The possible combinations of this pairing are Tt, Tt, tt and tt

Genetics of Inheritance: Tongue rolling - YouTub

  1. ant. Neither part of the myth is true. Earlobes ranging from unattached (upper left) to.
  2. ant allele. Allele that is phenotypically expressed over another allele. Recessive allele
  3. Drag-and-Drop Pedigree 1: Tongue Rolling. Pedigree.ppt. Karyotyping Activity. BluePeopleLab. Fourni par Traduction Biology Lab The. Blue People Of Troublesome Names:Creek, KY Introduction: Hereditary methemoglobinemia (met-H) is a human genetic disease that is inherited as an autosomal recessive. The image above shows the pedigree of the blue.

Each pedigree should be on an 8.5 x 11 in. piece of paper. Each pedigree should have a key; use appropriate pedigree symbols. Also note for each individual: A. Phenotype. B. Name of relative. List of possible traits: (choose four) Tongue rolling (RR or Rr = roller, rr = non-roller) Attached earlobes (EE or Ee = unattached, ee = attached Key Pedigree Analysis Worksheet Mrs Paulik S Website from sites.google.com Tess turned and raced for the back door. Trait r is the mendelian trait in humans for tongue rolling. Pedigree practice problems worksheet answers pdf. In a pedigree, males are represented by squares and females by circles. Environmental causes, you need information from. Frequency of tongue rollers and pedigrees of tied tongues in Japan. J. Hered. 42: 293-297, 1951. Lee, J. W. Tongue-folding and tongue-rolling in an American Negro population sample. J. Hered. 46: 289-291, 1955 ABP-25 To study the prepared pedigree charts of genetic traits such as rolling Of tongue, blood groups, peak, colour blindness etc. × Laser microscope lab instruments abron01@gmail.co Each pedigree should go back at least 3 generations. (Grandparents, Parents and you) Each pedigree should have a key; use appropriate pedigree symbols. Also note for each individual: Genotype (when able) Name of relative. List of possible traits: (choose one) Tongue rolling (RR or Rr = roller, rr = non-roller

Biology Champ | Genetic disorders

Title: PEDIGREE CHARTS 1 PEDIGREE CHARTS . A family history of a genetic condition; 2 Quick Review. Genotype what genes someone has ; Genes are usually represented by a letter, a capital letter for the dominant trait, a small case for the recessive. Example Tongue Rolling is dominant, so we use R to represent the tongue rolling Given below is a pedigree chart showing the inheritance of a certain sex-liniked trait in humans. The Trait traced in the above pedigree chart is (1) dominant X-linked (2) recessive X-linked Hair pigment of mouse and tongue rolling in humans (4) Human eye colour and sickle cell anaemia. Q119

Traits04 mendelian genetics and humansJEE Main, JEE Advanced, CBSE, NEET, IIT, free study

Human genetics is the study of inheritance as it occurs in human beings.Human genetics encompasses a variety of overlapping fields including: classical genetics, cytogenetics, molecular genetics, biochemical genetics, genomics, population genetics, developmental genetics, clinical genetics, and genetic counseling. Genes are the common factor of the qualities of most human-inherited traits Construct a pedigree (or pedigrees), which traces a trait through a family as far as possible. Phenotypes will be coded on the tree using a key that you create. The family can be your family or any other family you choose. Tongue rolling Non-tongue rolling. PTC Taster Non-PTC taster. Widow's Peak Straight hairline produce a pedigree. for an easily observable trait in your family (eye color, hair color, attach or free ear lobes, widows peak, rolling your tongue). Try to get 3 generations (you & siblings, parents, aunts, uncles, & grandparents). Click on the problem button and write your answer below Non—Tongue Rollers Roller 1. 2. Your teacher will give your group a set of pedigrees. Al and A2 are pedigrees for the PTC-tasting trait. Bl and B2 are pedigrees for the tongue-rolling.trait. When you get your pedioree, follow the directions at the top of the Group Data table to complete the blanks on the table. Study your group's pedigrees Tongue rolling, the ability to curl the edges of one's tongue, was considered to be an autosomal dominant trait until a recent study found that some identical twins do not share the ability. Livingston Public Schools / LPS Homepag