Question
Asked Oct 15, 2019
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5. Which of the following couples could have a boy with Duchenne muscular dystrophy (DMD)? 

a. a male with Duchenne muscular dystrophy and a homozygous dominant female

b. a male without Duchenne muscular dystrophy and a homozygous dominant female

c. a male without Duchenne muscular dystrophy and a carrier female

d. a and c

e. none of the above

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Expert Answer

Step 1

Duchenne muscular dystrophy (DMD) is an inherited genetic disorder with progressive weakness and degeneration of voluntary muscles. It occurs due to the defect in a protein called dystrophin that keeps the muscle cells intact. This disorder typically affects the boys and girls are mildly affected and remain as carriers.

Step 2

Correct answer: Option c. 

Reason for correct answer:

Option c is given as ‘a male without Duchenne muscular dystrophy and a carrier female’.

The DMD is an X-linked recessive disorder and it is passed on by the mother to the child. Thus a male without DMD and female carrier coul...

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