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Unformatted text preview: BIOLOGY 100 GENETICS PROBLEMS 1. In Holstein cattle, the allele for black-and-white hides ( B ) is dominant to the allele for red- and-white hides ( b ). A bull with the dominant phenotype is mated to a large number of cows all having the recessive phenotype. All the calves produced by these matings have black- and-white hides. a. What is the genotype of all the cows in these matings? b. What is the presumed genotype of the bull given the results of these matings? c. What is the presumed genotype of the calves? 2. Albinism (lack of skin pigmentation) is caused by a recessive allele. A man and woman, both normally pigmented, marry and have an albino child. a. What are the genotypes of the mother, father, and child? b. The couple decides to have a second child. What is the probability that the child will have normal pigmentation? 3. What kinds of gametes can be produced by an individual with genotype Bb ? With genotype AaBb ? How about AaBB ? 4. In humans, pointed eyebrows ( P ) are dominant over smooth eyebrows ( p ). Mary’s father has pointed eyebrows, but she and her mother both have smooth eyebrows. What is the genotype pointed eyebrows, but she and her mother both have smooth eyebrows....
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- Spring '08
- Zygosity, recessive allele