HEREDITY
MULTIPLE ALLELES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Look at this cross:XBXb x XBY What proportion of the male children are colorblind?
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100%
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75%
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50%
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25%
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Explanation:
Detailed explanation-1: -It’s estimated that up to eight per cent of boys have some degree of colour blindness (also known as colour vision deficiency or CVD), whereas less than one per cent of girls do. That’s about one in 12 boys, and around one in 200 girls. What causes colour blindness?
Detailed explanation-2: -The Y chromosome does not have the gene for color vision. Normal color vision (XB) is dominant over color-blindness (Xb). 1. A color-blind man (XbY) and a homozygous dominant woman (XBXB) have two sons and two daughters.
Detailed explanation-3: -Males that are X+Y have normal color vision, while XcY males are colorblind.
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