In Mendelian genetics, what is the expected phenotypic ratio in the F2 generation of a monohybrid cross between two heterozygous individuals (Aa x Aa)?
Answer and explanation
Correct answer: A. 3 : 1 (dominant to recessive phenotype)
- Step 1: Punnett square yields 1 AA, 2 Aa, 1 aa. Step 2. AA and Aa exhibit the dominant phenotype (3), while aa exhibits recessive (1). Step 3. The phenotypic ratio is 3:1. Answer: 3 : 1 (dominant to recessive phenotype). Why not the others: 1:2:1 is the genotypic ratio; 9:3:3:1 is a dihybrid cross.
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