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An X-linked recessive allele, r, produces red-green colorblindness in humans. A normal woman whose father was...

An X-linked recessive allele, r, produces red-green colorblindness in humans. A normal woman whose father was colorblind marries a colorblind man.

a. What is the chance that the first child from this marriage will be a colorblind boy?

b. What is the chance that the first child from this marriage will be a colorblind girl?

c. If the couple have three children, what is the probability that two of them will be colorblind boys and one will be a normal child (boy or girl)?

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