please explain to me how i should go about solving this problem…… in 1986 nation

Question

please explain to me how i should go about solving this problem……

in 1986 national geographic magazine conducted a survey of its readers abilities to detect odors. About 7% of caucasians in the u.s. could not smell the odor of musk. If both parents could not smell musk, then none of thier children were abgle to smell it. On the other hand two parents who could smell musk generally had children who could smell it, too, but a few of the children in those familes were unable to smell it. if a single pair of alleles governs this trait, is the ability to smell musk best explained as an example of dominant or recessive inheritance?

Explanation / Answer

According to the information given, the ability to smell musk, is an dominant inheritance.

Because if both parents contain the dominant trait then only the progeny can inherit. In the first case none of the parent have the trait, so progeny did not recieve it.

It is said that few of the children in those families were unable to smell it, because one of the parent is heterozygous to that trai, and child did not inherit the trait.

Therefore trait should be dominant.

XSXs (can smell)   *   XSY (can smell)

progeny-

XSXS(can smell)

XSY(can smell)

XSXs(can smell)

XsY(cannot smell)

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