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These two, because there's a Y chromosome, these would be them having a son. In this case it is a sex-linked problem. And now I'll draw my little Punnett square here. I A and I B are co-dominant. An organism with a recessive allele for a particular form of a trait will have that form only when the dominant allele for the trait is not present Homozygous: I use capital H for the dominant allele, which you would say is no hemophilia. Website by Duncan Wilson.

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In this case you were told the parents were heterozygous.

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Mendelian Genetics

Give genotypic and phenotypic ratios. Only one trait is used in the genetic cross. So, a carrier woman means that one of her two X chromosomes would have the hemophilia allele, and the other one wouldn't. There is a blending with the heterozygous offspring. Well, one out of these four scenarios is a hemophiliac son. The phenotypic ratio would therefore be 1:

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