The genotypic ratio of the F2 generation of a monohybrid cross is
- A. 1:2:1
- B. 3:1
- C. 9:3:3:1
- D. 1:1
Explanation
Of four F2 offspring one is homozygous dominant, two are heterozygous and one is homozygous recessive. This becomes the familiar three to one only when the phenotypes are counted, because the homozygous dominant and the heterozygote look the same. The two ratios describe the same cross from two different angles, so read the question carefully before answering.
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