albinism in humans is inhereted as a simple recessive trait.determine the genoty

Question

albinism in humans is inhereted as a simple recessive trait.determine the genotypes of the parents and offspring for thefollowing families. when alternative genotypes are possible, listboth. A) two nonalbino(normal) parents have five chlidren, fournormal and one albino. B) a normal male and an albino female have six children, allnormal. From Essentials of genetics william S. Klug 5th edition albinism in humans is inhereted as a simple recessive trait.determine the genotypes of the parents and offspring for thefollowing families. when alternative genotypes are possible, listboth. A) two nonalbino(normal) parents have five chlidren, fournormal and one albino. B) a normal male and an albino female have six children, allnormal. From Essentials of genetics william S. Klug 5th edition

Explanation / Answer

Assuming the Let's call the recesssive allele 'a' and the dominantwildtype 'A' a) The albino child has genotype 'aa' so the parents must both becarriers. The parents' genotypes are the same, 'Aa'      | A    a A | AA Aa a   | Aa   aa So all of the children have one of the genotypes in the crossabove. B) The mother's genotype is aa. The father could be a carrieror homozygous for the dominant allele , so he's either Aa orAA. Let's do a cross for both cases:      A a a | Aa aa a | Aa aa or      A A a | Aa Aa a | Aa Aa So all of the children have one of the genotypes in the crossesabove.

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