PATHOLOGY MCQ
GENETICS AND DISEASE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A carrier mother to pass the gene on to her daughter
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A color blind father to pass the gene on to his daughter
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A color blind father to pass the gene on to the son
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A carrier mother to pass the gene on to her son
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Detailed explanation-1: -You can not inherit it from him if you are male and your father suffers from a red-green colour vision deficiency. Only women who pass it on to their sons may be carriers of colour blindness. The correct answer is option(C) Males can be carriers of traits.
Detailed explanation-2: -Examples of X-linked recessive conditions include red-green color blindness and hemophilia A: Red-green color blindness. Red-green color blindness simply means that a person cannot distinguish shades of red and green (usually blue-green). Their visual acuity (ability to see) is normal.
Detailed explanation-3: -Red-green color blindness is a sex-linked recessive trait in humans. It is caused by a genetic mutation on the X chromosome. It is a recessive trait, and males are more likely to be affected because males have only one X chromosome.
Detailed explanation-4: -If a female has defects in both sex chromosomes, they will develop color blindness. However, if they have a defect in only one X chromosome, she will be a carrier. Due to the above reasons, color blindness is called a sex-linked recessive disorder.