GENETICS AND EVOLUTION
EVOLUTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A mom with the heterozygous gene for Widows peak and a father with the heterozygous gene for Widows peak:odds their baby HAS a widow’s peak?
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0%
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25%
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75%
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100%
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Explanation:
Detailed explanation-1: -If both parents are heterozygous (Ww), there is a 75% chance that any one of their offspring will have a widow’s peak (see figure). A Punnett square can be used to determine all possible genotypic combinations in the parents. A pedigree that depicts a dominantly inherited trait has a few key distinctions.
Detailed explanation-2: -Of the four possible combinations of gametes, three will result in the dominant widow’s peak phenotype and only one for the straight hairline. The probability is 75% for widow’s peak, and 25% for no widow’s peak. At each pregnancy, this couple has a 1/4 chance of having a child without a widow’s peak.
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