Answer:

D. 60

Explanation:

In a cross between tall pea plants (T) and dwarf pea plants (t), where T represents the dominant allele for height and t represents the recessive allele for dwarfism, the genotype of the F1 generation would be heterozygous (Tt).

When you cross two F1 heterozygous plants (Tt x Tt), you would expect a phenotypic ratio of 3:1 in the F2 generation, with 3/4 of the plants being tall (T_) and 1/4 being dwarf (tt).

So, out of 80 plants in the F2 generation, you can expect:

3/4 * 80 = 60 plants to be tall.

Therefore, the correct answer is D. 60.

Verified answer

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In a cross between tall (dominant) and dwarf (recessive) pea plants, the F1 generation will all be tall because the tall trait is dominant. When you cross two heterozygous (Tt) F1 plants, you can use a Punnett square to determine the genotypic and phenotypic ratios in the F2 generation.

In this case, the cross would be:

F1 (Tt) x F1 (Tt)

The possible genotypes in the F2 generation are: TT, Tt, and Tt.

The phenotypic ratio for tall (T) to dwarf (t) plants in the F2 generation is typically 3:1.

So, in a population of 80 plants, you can expect:

(3/4) × 80 = 60 tall plants

Therefore, the correct answer is:

D. 60