PATHOLOGY MCQ
GENETICS AND DISEASE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Colorblindness is more common in males than in females because the allele for colorblindness is
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dominant and located on the X chromosome.
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recessive and located on the Y chromosome.
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recessive and located on the X chromosome.
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recessive and located on the Y chromosome.
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Explanation:
Detailed explanation-1: -Males have 1 X chromosome and 1 Y chromosome, and females have 2 X chromosomes. The genes that can give you red-green color blindness are passed down on the X chromosome. Since it’s passed down on the X chromosome, red-green color blindness is more common in men.
Detailed explanation-2: -A recessive allele on the X chromosome is responsible for red-green color blindness in humans. A woman with normal vision whose father is color-blind marries a color-blind male.
Detailed explanation-3: -The recessive chromosome is represented as Xr. Since males have only one X-chromosome, if this chromosome has the red-green color blind allele, the males will have the color perception defect. Females have 2 X-chromosomes.
There is 1 question to complete.