题目
题目

Bio 93 Section CDE 2025 Final Exam Practice, Part 1

单项选择题

Albinism is a recessive trait. A man and woman who both have normal pigmentation have one child out of three who has albinism (without melanin pigmentation). What are the genotypes of this child's parents?

选项
A.Both parents must be heterozygous.
B.One parent must be homozygous for the recessive allele; the other parent can be homozygous dominant, homozygous recessive, or heterozygous.
C.One parent must be homozygous dominant; the other parent must be heterozygous.
D.One parent must be heterozygous; the other parent can be homozygous dominant, homozygous recessive, or heterozygous.
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标准答案
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思路分析
The question describes albinism as an autosomal recessive trait. When both parents have normal pigmentation but have a child with albinism, it implies both parents carry the recessive allele (they are heterozygous). In genetic terms, Aa x Aa can produce three possible genotypes among offspring: AA (normal, non-carrier) 1/4, Aa (normal pigmentation but carrier) 1/2, and aa (albino) 1/4. The observat......Login to view full explanation

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