A heterozygous plant (Aa) is crossed with a homozygous recessive plant (aa). What is the expected ratio of offspring genotypes?
Answer and explanation
Correct answer: C. 1 Aa : 1 aa
- Step 1: Gametes from Aa are A and a; from aa only a. Step 2. Offspring are Aa (A from the first parent) or aa (a from the first parent) in equal numbers. Answer: 1 Aa : 1 aa. Why not the others: AA cannot occur because the aa parent has no A, and all-Aa would need an AA parent.
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