Solution: Galactosemia is a disorder that results from the inheritance of two recessive alleles (ex. aa genotype). Indicate the possible genotypes of the individuals in the pedigree chart below by placing AA, Aa, or aa below the squares and circles.

Problem

Galactosemia is a disorder that results from the inheritance of two recessive alleles (ex. aa genotype). Indicate the possible genotypes of the individuals in the pedigree chart below by placing AA, Aa, or aa below the squares and circles.

Solution

Being a recessive trait, the emergence of an afflicted individual in the progeny of the parents shown simply means that both are carriers of the allele and both these recessive alleles have been inherited by the first child.

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