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QUESTION 19 A study has shown that if adoptive parents develop asthma, then their adopted child...

QUESTION 19

A study has shown that if adoptive parents develop asthma, then their adopted child is more likely to have asthma. This suggests that asthma is linked strongly to

a genetic component.

an environmental component.

QUESTION 20

  1. Most pedigrees showing the hypothetical human trait show the following characteristics:

    • Only males are affected.
    • Affected fathers always pass the trait to sons.

    What is the MOST likely mode of inheritance for this disorder?

    A.

    Y-linked
    B.

    X-linked dominant
    C.

    autosomal recessive
    D.

    X-linked recessive
    E.

    autosomal dominant
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Answer #1

Q19. An environmental component.

Adoptive parents and adopted child are not genetically related. Asthma is always caused by air borne allergens or by some respiratory infections.

Q 20. A. Y-linked.

Females have two X chromosomes and no Y chromosome. So, they cannot inherit Y- linked genetic disorders. In this case, all sons will inherit the disorder from an affected father, as sons can inherit Y chromosome only from their father. Mostly, the y chromosome is passed unchanged from father to son.

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