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BIOCHEM C785 2 OA readiness check

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9. The pedigree below tracks Duchenne Muscular Dystrophy (DMD) through several generations. What type of inheritance does DMD express? (1/1 Points) Autosomal dominant Autosomal recessive X-linke ... d Dominant X- Linked recessive The correct answer is X- linked recessive because parents (carriers) do not have it (II-5- 6) but a child does (III-5). You will get the same result if you consider parents (carriers) (I-1-2), who do not have the trait, but a child does (II-3). A third option that gives the same result (X-linked recessive) is by considering parents (carriers) who do not have the trait (III-1-2), and their child does (IV-1). The pattern is recessive because the selected parents are carriers, and it is X-linked because only males have the trait. 10. If you had a mother who is homozygous for a recessive disease, and a father who is a heterozygous carrier, what percentage of children will have the disease? (1/1 Points) 0% 25% 50% The correct answer is 50%. Homozygous recessive: aa Heterozygous: Aa When you see "percentage" or "probability," think Punnett square. 50% of the children would be expected to be Aa, and 50% of the children would be expected to be aa. 75% 100% [Show More]

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