A man and a woman that are both heterozygous for the allele for brown eyes (blue

Question

A man and a woman that are both heterozygous for the allele for brown eyes (blue eyes are the recessive trait) are planning on having children.

a. Assuming a sex ratio of 1:1, what is the expected distribution of the sexes if they have seven children, i.e., what are the male/female frequencies for all possible seven-child families? Show your work.

b.   Suppose they have three children with blue eyes and four with brown eyes. Are the observed progeny numbers consistent with Mendelian expectations? State your hypothesis, predictions, calculations, P value, and conclusion.

Explanation / Answer

a ans--Father ---Bb

Mother----Bb

Progeny will be-1BB:2Bb:1bb

BB--25%--- Brown eyes

Bb----50%---Brown eyes

bb----25%----blue eyes

according to the results only one child will have blue eyes and rest all the 6 cildren will have brown eyes.

b ans-These observation are not go tthrough with mendelian laws bacause only 25% progeny will be the blue eyes.

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