The pedigree below tracks Duchenne Muscular Dystrophy (DMD) through several generations. DMD is an X-linked recessive trait.

What is the genotype of individual II-2?

Choose 1 answer:
(A) $\mathrm{X}^{d} \mathrm{Y}$
(B) $\mathrm{X}^{D} \mathrm{X}^{D}$
(c) $\mathrm{X}^{D} \mathrm{X}^{d}$
(D) $\mathrm{X}^{d} \mathrm{X}^{d}$

Question

The pedigree below tracks Duchenne Muscular Dystrophy (DMD) through several generations. DMD is an X-linked recessive trait.

What is the genotype of individual II-2?

Choose 1 answer:
(A) $\mathrm{X}^{d} \mathrm{Y}$
(B) $\mathrm{X}^{D} \mathrm{X}^{D}$
(c) $\mathrm{X}^{D} \mathrm{X}^{d}$
(D) $\mathrm{X}^{d} \mathrm{X}^{d}$

Accepted Answer

***C*** ∻Key Concept∻ ⚹X-linked recessive inheritance⚹ ∻Explanation∻ ⚹Duchenne Muscular Dystrophy (DMD) is an X-linked recessive disorder. For a female to be affected, she must have two copies of the recessive allele (XdXd). Since individual II-2 is unaffected but has an affected son, she must be a carrier (XDXd).⚹◊What is the inheritance pattern of Duchenne Muscular Dystrophy, based on the information provided in the pedigree chart?⍭ Generate me a similar question◊

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