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19 November, 03:00

g In humans, a widow's peak hairline is dominant while a straight hairline is recessive. Tom and Sue both have a widow's peak but their son Joe has a straight hairline. If they have another child, what is the genetic probability of that child having a widow's peak hairline

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  1. 19 November, 05:25
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    3/4

    Explanation:

    In humans, a widow's peak hairline is dominant while a straight hairline is recessive.

    Tom and Sue both have a widow's peak but their son Joe has a straight hairline.

    For Joe to have a straight haircut which is inherited in the recessive condition, that means both parent each has a recessive allele copy for this trailer making them heterozygotes for the trait.

    If the widow's peak allele is W (genotype for heterozygote would be Ww)

    A cross between these two heterozygotes gives

    Ww x Ww

    WW Ww Ww ww

    3/4 widow's peak 1/4 straight hair line

    The genetic probability of that child having a widow's peak hairline is 3/4 ...
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