Question

9.The allele for freckles is dominant to the allele for no freckles. A freckled man and...

9.The allele for freckles is dominant to the allele for no freckles. A freckled man and a woman without freckles have two children, a boy with freckles and a girl without freckles. Using a Punnett square, determine the genotypes of all four individuals.

Mom: X^f X^f

Dad: X^f Y

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Answer #1

Genotypes of 4 individuals in the family are

Father - Ff

Mother - ff

Boy - Ff

Girl - ff

Punnet square -


Explanation
Allele for freckles - F (dominant)

Allele for no freckles - f (recessive)

**One of the parents has freckles and one do not.

One with freckles can be of genotype FF or Ff

One without freckles must be ff

**One of the children has freckles(boy) and one do not(girl).

Boy can be of genotype Ff or ff

Girl has a genotype ff

** As one child is having ff genotype , both f alleles should come from each parents.

So genotype of freckled man must be Ff

**As one parent is of genotype ff, genotype of freckled boy can never be FF . He has genotype Ff

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