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:

Denote the dominant allele as F and the recessive allele as f. What are the genotypes pf Michelle, John, and Kayla? (3 Points)

Michelle:

John:

Kayla:

Are freckles dominant or recessive? Briefly explain how you now (3 sentence limit). (2 Points)

Explanation / Answer

It is the dominant trait.

Phenotype of Mitchell is ff.

Phenotype of John is FF

Phenotype of Kayla is Ff.

It can not be recessive because all their children have freckles and only one of the parents are affected. This determines that the freckle is a dominant trait.

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