Asked by john
Some people have freckles, and some people do not have freckles. If a child has freckles, at least one parent has freckles. However, the child may have a sibling that does not have freckles. Which statement best describes the presence of freckles?
Freckles are not determined by DNA.
There are two alleles for freckles.
There is no dominant allele for freckles.
Freckles are determined by two genes instead of by one.
All Answers 1
Answered by
GPT-5 mini
AI
"There are two alleles for freckles."
Reason: The pattern described fits a single-gene dominant trait. If freckles are dominant (allele F) and no freckles is recessive (f), a freckled child must carry at least one F allele, so at least one parent must show freckles. Two freckled parents can be heterozygous (Ff) and produce an unflecked (ff) sibling. A simple Punnett-square (Ff × Ff) yields 3 freckled : 1 not freckled, illustrating the observation.
Reason: The pattern described fits a single-gene dominant trait. If freckles are dominant (allele F) and no freckles is recessive (f), a freckled child must carry at least one F allele, so at least one parent must show freckles. Two freckled parents can be heterozygous (Ff) and produce an unflecked (ff) sibling. A simple Punnett-square (Ff × Ff) yields 3 freckled : 1 not freckled, illustrating the observation.
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