What is the expected phenotypic ratio in the F2 generation of a classic Mendelian monohybrid cross with complete dominance?
Answer and explanation
Correct answer: A. 3 dominant to 1 recessive
A monohybrid cross (Aa x Aa) yields a 1:2:1 genotypic ratio (1 AA : 2 Aa : 1 aa) and a 3:1 phenotypic ratio (3 dominant : 1 recessive) under complete dominance. 1:2:1 phenotypic ratio occurs in incomplete dominance or codominance.
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