APFIVE Dihybrid Testcross Phenotypic Ratio
A plant heterozygous for two traits (AaBb) is used in a testcross, and the resulting offspring exhibit a 1:1:1:1 phenotypic ratio. Which of the following is the most likely explanation for this result?
A
Codominance between the alleles
B
The genes are linked on the same chromosome
C
Incomplete penetrance of the dominant alleles
D
The genes are on different chromosomes but one parent is heterozygous
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