Home Biology Principles of Inheritance and Variation General A man and woman are both affected by vitamin…
Biology Principles of Inheritance and Variation General Single Correct MCQ
Published on: August 11, 2026

A man and woman are both affected by vitamin D resistance rickets, which is a dominant sex-linked allele. All of the female off springs of this couple are affected with rickets but some of the male off springs are not. What are the genotypes of the parents?

A
Both are homozygous for the trait.
B
The woman has two dominant alleles and man has one dominant allele.
C
Both parents have only recessive alleles.
D
Each parent has only one dominant allele.

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