Question

The F2 generation phenotypes resulting from the monohybrid cross of purebreds display a ratio of _____. 4:1 2:1 3:1 none of the above

Answer 1

The correct answer would be 3:1

Let us take an example of TT and tt as purebreds.

T is a dominant trait which codes for tallness and t is a recessive trait which codes for a dwarf trait.

The F₁ generation would be Tt, that is, heterozygous dominant.

The F₂ generation would produce offspring with three possible types of genotypes TT, Tt, and tt in ratio 1:2:1.

Thus, the phenotype ratio would be 3 (tall): 1 (dwarf).