PATHOLOGY MCQ
GENETICS AND DISEASE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which statement about sex-linked traits is true?
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The Y chromosome carries many genes.
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The X chromosome has very few genes for traits other than sex.
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Sex-linked traits are caused by genes located on the Y chromosome.
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Recessive sex-linked traits appear more often in males than in females.
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Explanation:
Detailed explanation-1: -Recessive X-linked traits appear more often in males than females because, if a male receives a “bad” allele from his mother, he has no chance of getting a “good” allele from his father (who provides a Y) to hide the bad one.
Detailed explanation-2: -X-linked recessive diseases most often occur in males. Males have only one X chromosome. A single recessive gene on that X chromosome will cause the disease.
Detailed explanation-3: -Which statement is true of a sex-linked recessive gene? In an XY male, this recessive gene is always expressed.
There is 1 question to complete.