Genetics homework Genetics homework 1. PKU disease is autosomal recessive. Two c

Question

Genetics homework Genetics homework 1. PKU disease is autosomal recessive. Two carriers for PKU disease marry. What are the probabilities of the phenotypes and genotypes of their offspring? 2. Purple flowers are dominant to white flowers. A heterozygous purple flower is crossed with a white flower. What are the probabilities of the phenotypes and genotypes of their offspring? 3. Freckles are dominant. A woman with no freckles marries a man with homozygous freckles. What are the probabilities of the phenotypes and genotypes of their offspring? 4. A woman who is heterozygous for freckles and a carrier for PKU disease marries a man who is also heterozygous for freckles and a carrier for PKU disease. List the probability for each of the four possible phenotypes (not genotypes) in their offspring. 5. A man homozygous for freckles and homozygous for PKU disease marries a woman with no freckles who is a carrier for PKU discase. What are the probabilities for each phenotype possible in their offspring? 6. A man with heterozygous type A blood marries a woman with homozygous type B blood. What are the probabilities of the phenotypes and genotypes of their offspring? 7. Color blindness is X-linked recessive. A man with color blindness marries a normal woman with no history of the disease in her family. (She is not a carrier.) What is the chance of them having a child with color blindness? 8. A woman's father had color blindness. Her mother is normal. A. What is the woman's genotype? B. The above woman marries a normal man. What is the chance of them having A girl with color blindness? A boy with color blindness? 9. Huntington disease is autosomal dominant. A man who is heterozygous for Huntington disease marries a normal woman. What are the probabilities of the phenotypes and genotypes of their offspring?

Explanation / Answer

1. PKU is a autosomal recessive condition (pp). Two heterozygous individuals for PKU (Pp) got married.

Pp x Pp

The offspring produced are in 3:1 ratio. Offspring produced include 25% without PKU. The heterozygous carrier of condition are account for 50% and 25% offspring are asffected. The genotype ratios include 1PP : 2Pp : 1pp

male/ female P p P PP Pp p Pp pp

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