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Red (ginger) hair is due to a recessive allele at the MC1R gene. Your friend has...

Red (ginger) hair is due to a recessive allele at the MC1R gene. Your friend has red hair

, but neither of their (biological) parents do. What is the probability that your friend’sfull sibling has red hair?

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Answer #1

Red (ginger) hair is due to a recessive allele at the MC1R gene. a person (friend) which has red hair, but neither of their parents do because the genotype of parents is heterozygous (XRX(male), XRX (female)). The probability of that person's (friend) full sibling with red hairs can be analysed by the following cross

XRX(male) x XRX (female)

By the above cross four sibling- XRX, XRX, XX, and XRXR

So the probability of that person's (friend) full sibling with red hairs is 1/4.

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