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Lecture Assignment 5

Lecture Assignment 5 - 3 In rabbits a series of multiple...

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Biology 202 Homework 5 Due in Discussion Class – Week 7 (Feb. 27-Mar. 3) 1. Skin pigmentation is governed by 1 gene with two alleles and albino skin is recessive to normal pigmentation. An albino male has blood type A. His father has type O blood. He marries a woman with normal pigmentation and with blood type B. Here mother is an albino with type O blood. What is the probability that this couple will have albino children with type O blood? 2. In a plant, a tall variety was crossed with a dwarf variety. All F 1 plants were tall. When F 1 plants were interbred, 9/16 of the F 2 were tall and 7/16 were dwarf. a. Explain the inheritance of height by indicating the number of genes involved and by designating which genotypes yield tall and which yield dwarf in all generations (use dashes where appropriate). b. What proportion of the F 2 plants will be truebreeding for genotype if self-fertilized? c. What proportion of the F 2 plants will be truebreeding for phenotype if self-fertilized?
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Unformatted text preview: 3. In rabbits, a series of multiple alleles controls coat color in the following way: C is dominant to all other alleles and causes full color. The chinchilla phenotype is due to the c ch allele, which is dominant to all alleles other than C . The c h allele, dominant only to c a (albino), results in the Himalayan coat color. Thus, the order of dominance is C > c ch > c h > c a . For each of the following three cases, the phenotypes of the P generations of two crosses are shown, as well as the phenotype of one member of the F 1 generation. For each case, determine the genotypes of the P generation and the F 1 offspring (use dashes if appropriate). In addition, predict the phenotypic results of making each cross between F 1 individuals as shown. a. Himalayan X Himalayan Full color X Albino i Albino X Chinchilla i ?? b. Albino X Chinchilla Full X Albino i Albino X Full ?? c. Chinchilla X Albino Full X Albino Himalayan X Himalayan i ??...
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