10.A man and a woman both have freckles, which is a dominant trait. They have two children- one has freckles and one does not. What are the alleles of the parents?It is impossible to tellFf and FfFF and Ffff and Ff
Question
10.A man and a woman both have freckles, which is a dominant trait. They have two children- one has freckles and one does not. What are the alleles of the parents?It is impossible to tellFf and FfFF and Ffff and Ff
Solution
The parents' alleles are most likely Ff and Ff. Here's why:
Freckles are a dominant trait, which means that the presence of at least one dominant allele (F) will result in freckles. The fact that one of their children does not have freckles indicates that this child must have received a recessive allele (f) from each parent, making the child's genotype ff.
For this to happen, each parent must carry at least one recessive allele. Therefore, the most likely genotype for each parent is Ff (one dominant allele for freckles and one recessive allele).
If either parent had the genotype FF, all of their children would have freckles because they could only pass on the dominant allele. If either parent had the genotype ff, they would not have freckles themselves. Therefore, the only possible combination is Ff and Ff.
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