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A man and woman both have one parent who has albinism but both (man and woman...

A man and woman both have one parent who has albinism but both (man and woman ) have normal skin pigmentation. What is the probability that their first child will have albinism if albinism is a recessive trait?

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Answer #1

Albinism = Autosomal recessive trait.
Alleles :-
A (Dominant allele) = Normal pigmentation
a ( recessive allele) = Albinism.

Genotype and phenotypes :-
AA ( Homozygous dominant) = Normal skin
Aa ( Heterozygous) = Normal skin.
aa ( Homozygous recessive) = Albino.

Now in question,
Both man and woman phenotype = Normal skin, Genotype = AA or Aa.
• Both man and woman has one albino parent (aa), it means they got allele "a" from albino parent and now both man and woman are heterozygous.

Man -
Genotype = Aa
Gametes = A and a.

Woman -
Genotype = Aa
Gametes = A and a.

Punnett square -


So, probability of albino child is - 1 out of 4 children. = 1/4 or 25%.

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