In a monohybrid cross between two heterozygous tall pea plants (Tt × Tt), the expected phenotypic ratio of tall to dwarf offspring is
A1 : 2 : 1
B3 : 1CORRECT
C9 : 3 : 3 : 1
D1 : 1
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The cross gives genotypes TT, Tt, Tt and tt in the ratio 1 : 2 : 1. Since TT and Tt are both tall, the phenotypes are 3 tall : 1 dwarf. The 1 : 2 : 1 ratio describes genotypes, not phenotypes, and 9 : 3 : 3 : 1 is a dihybrid ratio.
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