General Science • BiologyHard

In human genetics, a colorblind father and a homozygous normal vision mother have children. What is the expected phenotypic probability of their sons inheriting red-green colorblindness?

A. Zero percent because sons inherit their X chromosome exclusively from their mother✓ Correct Answer

B. Fifty percent chance for each son to inherit the affected X chromosome

C. One hundred percent of sons will be affected by red-green colorblindness

D. Twenty-five percent chance due to recessive autosomal suppression

💡 Solution & Explanation

Red-green colorblindness is an X-linked recessive genetic trait where a father passes his Y chromosome to his sons and his X chromosome to his daughters, meaning sons receive their single X chromosome from their homozygous normal mother, making all sons unaffected carriers or normal. Daughters become carriers of the trait. John Dalton studied inherited color vision deficiency.

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In human genetics, a colorblind father and a homozygous normal vision mother have children. What is the expected phenotypic probability of their sons inheriting red-green colorblindness?

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