Daltonism

I know that female mammalians randomly inactivate one X chromosome in somatic cells.So, if a human female was daltonism carrier, would not she be half daltonic?Because, ~1/2 of her cells in retina would have a recessive allele and the other half would have the dominant allele?Or ...

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You just need to find which combination would produce this effect. 1. ALL boys are affected. Therefore, BOTH of mother's "X" chromosomes carry responsible allele. 2. Mother is NOT affected. Therefore, she is heterozygous for "X". There is only one way to reconcile this with the f...

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... on three gens (Red, Green, Blue). Gens R and G are on the same sexual chromosome X while B is autosomal. The lost of any of this gens result in Daltonism (result of an homozygous genotype or hemizygous recessive). A daltonic man marries a non daltonic woman and they have 4 girls and 4 boys. ...

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... So, punnett square shouldn't be used. But, we can still use it in some cases. Let me give you an example: A man has both illnesses (hemophilia and daltonism) and his wife is not ill or carrier for both of them. So, Man is (X^hd Y) and Woman is (X^HD X^HD). Punnett Square: ------------X^hd / Y X^HD......X^hd ...

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... in this case. But, Punnett square may be used in some situations like in a and can't be used in others like b: a) If a man has both hemophilia and daltonism > X^hd Y, no other possibility. It's also easy to predict genotypes of a woman who has both illnesses or none (while not being carrier). ...

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