Mr. Verma with a genetic disease marries a phenotypically n…

Biology Principles of Inheritance and Variation Skill Builder Single Correct MCQ

Published on: August 27, 2026

Mr. Verma with a genetic disease marries a phenotypically normal woman. They have three sons and three daughters; all of the daughters have the same disease as their father, but none of the sons is affected. The disease is caused by:

An X-linked recessive allele

An autosomal recessive allele

An autosomal dominant allele

An X-linked dominant allele

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(d) Because all of the daughters have the same disease as their father, but none of the sons is affected, the gene responsible for the genetic disease is located on the X chromosome of Mr. Verma. In X-linked dominant inheritance, only one copy of the allele is sufficient to cause the disorder.

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