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A women with albinic father marries an albinic man. The proportion of her progeny is

1. 2 normal : 1 albinic
2. all normal
3. all albinic
4. 1 normal : 1 albinic

Correct answer: 1 normal : 1 albinic

Solution

Albinism is typically recessive, so an albino father is aa and passes an a allele to all children. If the woman is phenotypically normal, she must be Aa; marrying an albino man (aa) gives offspring Aa and aa in equal numbers, producing a 1:1 normal-to-albino ratio.

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