NEET Biology question

A diseased man marries a normal woman and they get three daughters and five sons. All the daughters were diseased and sons were normal. The gene of this disease is

(A)Sex-linked dominantCorrect
(B)Sex-linked recessive
(C)Sex-limited character
(D)Autosomal dominant

Answer: (A)

Solution

Since the affected father passes his X-chromosome to every daughter (making all daughters affected if the allele is dominant) and his Y-chromosome to every son (so sons cannot inherit his X-linked allele at all, keeping them normal), this complete "all daughters affected, all

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Question ID VK-119580