What is the genotypic ratio resulting from a test cross between a heterozygous individual (Bb) and a homozygous recessive individual (bb)?
Answer and explanation
Correct answer: C. 1 : 1 (equal proportions of Bb and bb)
- Step 1: Test cross: Bb x bb yields 1/2 Bb and 1/2 bb. Step 2. The genotypic ratio is 1:1. Answer: 1 : 1 (equal proportions of Bb and bb). Why not the others: 3:1 is F2 phenotypic ratio; 1:2:1 is F2 genotypic ratio.
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