1. A man with Type A blood has children with a woman with Type B blood. However,

Question

1. A man with Type A blood has children with a woman with Type B blood. However, the genotypes of the man and woman are not known. a) List the possible phenotypes and genotypes of the offspring? Explain your reasoning.

For Questions 2 & 3: Color blindness is a sex-linked character. The allele for normal colored vision, XB , and is dominant over the allele for color blindness Xb .

2) What will be the result if a non-color-blind male has children with a female who is a carrier for colorblindness? Make sure to include sex with all genotype and phenotype ratios of the F1 generation.

3) A man and a woman have a daughter who is color-blind. What are the genotypes of the parents?

Explanation / Answer

Possible phenotypes and genotypes of the children are :

1- AB Ia Ib

2 A Ia i

3-B Ib i

4-O i i

That is because genotypes of the parents can be :

Man : Ia i

Woman : Ib i , Here Ia Ib are the dominant alleles Ia for A blood group and Ib for B blood groups where as i is the recessive allele.

2 question :

Normal male will be Xb Yb and Carrier Female will be XB Xb

Possible genotypes and phenotypes are :

Male 1 : XB Yb Color blind

Male 2: Xb Yb Normal

Female 1 : XB Xb Carrier

Female 2 : Xb Xb Normal

3rd question :

Genotype of woman : XB Xb

Man : XB Yb

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