Multiple choice

The phenotypic ratio of monohybrid cross is:

  1. 1 : 2 : 1

  2. 1 : 1 : 2

  3. 1 : 3

  4. 3 : 1
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D Correct answer
Explanation

In Mendel's monohybrid cross (F1 heterozygote × heterozygote), the phenotypic ratio is 3:1 (3 dominant phenotype : 1 recessive phenotype). 1:2:1 is the GENOTYPIC ratio. 1:3 and 1:1:2 are not standard Mendelian ratios.

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