They say freckles are skin stars that come from the kiss of an angel. However, w

Question

They say freckles are skin stars that come from the kiss of an angel. However, we know where they really came from and that is genetics. Michelle, who does not have freckles, and John, who has freckles, are parents to 3 kids, who all have freckles. Kayla, one of the 3 kids, had a son of her own who also has freckles. Freckles are the phenotype of the MCR1 gene, a single gene with two alleles. Answer the following question.

1) Denote the dominant allele as F and the recessive allele as f. What are the genotypes pf Michelle, John, and Kayla?

2) Are freckles dominant or recessive? Briefly explain how you know.

Explanation / Answer

The genotype of Mitchell (no freckles) ff

John( freckles) FF

Kayla (Freckles) Ff

2) freckles are dominant. If they have not been dominant all children would not have it.. all of the children are heterozygous for the gene. Ff

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