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.
Most pedigrees showing the hypothetical human trait show the
• Only males are affected.
• Affected fathers always pass the trait to sons.
What is the MOST likely mode of inheritance for this disorder?
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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