What phenotypic ratio would you expect as a result of a test cross between a dihybrid organism and one that is homozygous recessive for alleles at two independent loci? a. 3: 1b. 9: 3: 3: 1c. 1: 1: 1: 1d. 1: 2: 1e. 9: 4: 2: 1

c. 1:1:1:1

Explanation:

Dihybrid organism is an organism that is heterozygous at two different genetic loci. So, for example if there are two loci A and B, dihybrid organism would have AaBb genotype. Homozygous recessive for alleles at two loci has the genotype aabb.

P: AaBb  x  aabb

The possible genotypes are: AaBb  Aabb  aaBb  aabb

the correct answer is option b

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