The phenotypic ratio of the F2 generation of a monohybrid cross is
- A. 1:1
- B. 9:3:3:1
- C. 1:2:1
- D. 3:1
Explanation
Crossing two heterozygotes gives one homozygous dominant, two heterozygotes and one homozygous recessive, and since the first three all look alike the visible ratio is three to one. 1:2:1 is the genotypic ratio of the very same cross, which is why it is the standard trap. 9:3:3:1 belongs to a dihybrid cross and 1:1 to a test cross.
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