In humans, the allele for widow's peak hairline (W) is dominant to the allele for straight hairline (w). If a heterozygous person with a widow's peak marries someone with a straight hairline, what is the probability that their child will have a straight hairline?*1 point25%50%0%75%
Question
In humans, the allele for widow's peak hairline (W) is dominant to the allele for straight hairline (w). If a heterozygous person with a widow's peak marries someone with a straight hairline, what is the probability that their child will have a straight hairline?*1 point25%50%0%75%
Solution
The probability that their child will have a straight hairline is 50%. Here's why:
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The person with a widow's peak is heterozygous, meaning they have one dominant allele (W) and one recessive allele (w). We can represent this as Ww.
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The person with a straight hairline has two recessive alleles (w), as the straight hairline is recessive. We can represent this as ww.
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When these two people have a child, the child gets one allele from each parent. There are four possible combinations: Ww (from the first parent's W and the second parent's w), ww (from the first parent's w and the second parent's w), Ww (from the first parent's W and the second parent's w), and ww (from the first parent's w and the second parent's w).
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Out of these four possibilities, two result in a child with a straight hairline (ww). Therefore, the probability is 2 out of 4, or 50%.
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