PATHOLOGY MCQ
GENETICS AND DISEASE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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he will pass on this allele to all of his children
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he inherited one allele for color blindness from his mother
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he inherited two alleles for color blindness from his father
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he has one allele for color blindness and another allele for normal vision
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Detailed explanation-1: -This is because: Males have only 1 X chromosome, from their mother. If that X chromosome has the gene for red-green color blindness (instead of a normal X chromosome), they will have red-green color blindness.
Detailed explanation-2: -Red/green colour blindness is passed from mother to son on the 23rd chromosome, which is known as the sex chromosome because it also determines your sex.
Detailed explanation-3: -The quick answer is that yes, a female can get a copy of the gene that leads to colorblindness from her father. In fact, if her father is colorblind she will most certainly inherit a copy of the colorblindness gene.
Detailed explanation-4: -Males inherit one X chromosome from their mother. So, the sons will be color blind if their mother is color blind. Females inherit one X chromosome from each parent, so they will be carriers for the trait despite being phenotypically normal.