Answer to Question #107595 in Genetics for Adrian

Question #107595
In a cross of AaBb x AaBb, what fraction of the offspring can be expected to express one of the two dominant alleles, but not both?
1
Expert's answer
2020-04-02T12:02:50-0400

Genotypes of all offspring: AABB, 2AABb, 2AaBB, 4AaBb, AAbb, aaBB, 2Aabb, 2aaBb, aabb.

Fraction of the offspring with one of the two dominant alleles by gene А: 2AaBB, 4AaBb, 2Aabb - 50%.

Fraction of the offspring with one of the two dominant alleles by gene B: 2AABb, 4AaBb, 2aaBb - 50%.

Fraction of the offspring with only one of the two dominant alleles: 2Aabb, 2aaBb - 25%.


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