Introduction to Genetic Analysis
11th Edition
ISBN: 9781464109485
Author: Anthony J.F. Griffiths, Susan R. Wessler, Sean B. Carroll, John Doebley
Publisher: W. H. Freeman
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Chapter 2, Problem 72P
Summary Introduction
To determine: The ability to curl up the sides of the tongue to make a trough and its inheritance.
Introduction: A variation in the DNA that is general to be due only to a new mutation. A polymorphism possesses a frequency of at least one percent in the population. Examples of polymorphisms involve the genes for sickle cell disease, thalassemia, and G6PD deficiency.
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At least two pairs of genes control eye color. Both pairs influence the production of the pigment, melanin, but act independently. One pair of alleles is B (Brown color; dominant) and b (blue color); the other pair is A (pigment production; dominant) and a (no pigment production; albino). The gene pair aais epistatic to (masks) B and b and produces the nonpigmented eyes of the albino. What is the typeof gene interaction that exists between the two gene pairs?
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Chapter 2 Solutions
Introduction to Genetic Analysis
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- With regard to the ABO blood types in humans, determine the genotypes of the individuals below: John: John is blood type A and his mom was type B Genotype = Jane: Jane is blood type B and her dad was type O Genotype John and Jane have kids. What are the possible blood types of their offspring, including the expected ratio of each? O John is A1", Jane is l'i, the blood type ratios of their children would be: 1 AB: 1A : 1B John is IA, Jane is l1", the blood type ratios of their children would be: 1 AB: 1 B John is 1Ai. Janc is iP1P, the blood typc ratios of their children would be: 1 AB: 1 A: 1B John is Jane is IPi, the blood type ratios of their children would be 1 AB : 1A 1B:10arrow_forwardCertainly, not all Muppets look like the one shown in the picture below, nor do they all look the same. In fact, there’s a great deal of phenotypic variation in Muppets. Two traits that have been particularly well-studied are curly hair presences and skin color. One individual is a male, and he possesses a green skin and no hair, whereas the female individual possess a curly hair and pink skin. Let’s call the gene controlling skin coloration S and that controlling hair H. In this species, both hair and green skin are recessive traits. Both of the individuals shown are homozygous. 1. What is the genotypes of Miss Piggy: 2. Kermit's Genotype: 3. If these two lovebirds (er, love-muppets?) mated, what would their offspring look like? Describe all phenotype combinations possible and the ratios in which they would occur?arrow_forwardHuman hair color ranges from black to many shades of brown to blonde. What can you correctly conclude from this information? A Human hair color is controlled by a single gene. B Human hair color is controlled by environmental factors rather than genes. C Human hair color is controlled by more than one gene. D Black hair is dominant to blonde hair. Answer is C? Can you help me to explain to me step by step?arrow_forward
- Which of the following statements is true? The Creeper gene in chicken follows Mendelian Laws of heredity. The prevalence of roan color in cattle is incomplete dominance. The different colors of the skin signify multiple alleles. Expression of intermediate color follows non-Mendelian laws.arrow_forwardWhat are two possible explanations for why the same genotype (DNA) can result in different phenotypes (result)arrow_forwardSuppose that skin color in humans is controlled by 4 gene pairs, and that there are 2 alleles at cach gene pair (a "+" allele and a -"allele). Each "+ allele contributes a unit of pigment above a baseline minimum skin tone, and each "-" allele contributes no additional pigment. Which of the following genotypes would produce the same phenotype as A A BB CC D'D? Assume that exposure to sunlight and/or tanning beds are equal for all individuals. OA'A*B* B* CC D'D OA*A BBc c*D'Darrow_forward
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