The genotype of a female carrier of the X-linked recessive gene for Duchene muscular dystrophy is represented as

Question

Quizplus · Accepted Answer

The X-linked recessive gene for Duchenne muscular dystrophy is located on the X chromosome. In females, there are two X chromosomes, one from each parent. A female carrier has one normal X chromosome and one X chromosome with the recessive gene for Duchenne muscular dystrophy.

The genotype of a female carrier can be represented as XDXd, where X represents the normal allele and Xd represents the allele for Duchenne muscular dystrophy. Choice A (XDY) is incorrect because it represents the genotype of a male with one X and one Y chromosome. Choice C (XdY) is incorrect because it represents the genotype of a male with one X and one Y chromosome, where the X chromosome carries the recessive gene for Duchenne muscular dystrophy. Choice D (XDXD) is incorrect because it represents the genotype of a female with two normal X chromosomes.

The Genotype of a Female Carrier of the X-Linked Recessive