Question

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

Answer 1

Question:

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

Based on the pedigree, which of the following is true?

Answer:

CORRECT (SELECTED)

If individual III-1 marries an unaffected, non-carrier female, none of their offspring will have DMD.

Step-by-step explanation:

Individual III-1 is an unaffected male. If he mates with an unaffected, non-carrier female, there is no chance that the children will inherit the DMD allele.

Answer 2

- If individual III-1 marries an unaffected, non-carrier female, none of their children will have DMD

Step-by-step explanation:

From the options, the only correct statements is that If individual III-1 marries an unaffected, non-carrier female, none of their children will have DMD

DMD is an X-linked recessive trait, meaning that a male individual is either affected or unaffected (can never be a carrier). III-1 is unaffected and if he marries an unaffected, non-carrier female, it means that none of their children will have DMD.

All the children of II-4 and II-5 will always come out with DMD because both parents are affected.

Individuals I-1 and II-1 are males. A male can never be a carrier in for X-linked traits. He is either affected or unaffected and as shown by the pedigree, both males are unaffected (unshaded).