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Albinism

In case of al...

Question

In case of albino people,there is an absence of pigment. So, what will be the gene controlling their skin colour ?

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Solution

Albinism is a genetic disorder which is caused by a faulty gene. But skin color in such person is also under polygenic inheritance and is controlled by 3 genes A,B, and C. Though there will be no production of melanin due to genetic defect.

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Q. Albinism, lack of pigmentation in humans, results from an autosomal recessive gene designated 'a'. Parents with normal pigmentation have an albino child. What is the possibility that their next child be albino? What is the possibility that the next child will be an albino girl?

Q. Albinism is known to occur due to an autosomal recessive mutation. The first child of a couple with normal skin pigmentation was an albino. What is the probability that their second child will also be an albino?

Q. Assertion :Albinism in a man is controlled by recessive gene (a). If a normal pigmented man (Aa), a carrier, is crossed with albino female (aa) then 50% children will be albino. Reason: The ratio of albino and normal will be 1:2.

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Q. Human skin colour is controlled by several gene pairs. Let us assume here that there are just three gene pairs on different chromosomes and that for each pair there are two alleles, an incompletely dominant one that codes for melanin deposition. If a very dark skinned person marries a very light skinned woman, what will be the chance that their offspring will have very dark skin?

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