Question

Mendel crossed tall pea plants with short pea plants. the offspring were all tall plants.

1. Which allele is recessive?
2. Which allele is dominant?

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Answer 1

1. Allele for shortness (t)

2. Allele for tallness (T)

Step-by-step explanation:

Gregor Mendel performed numerous experiments using pea plants (Pisium sativum). He tested the height traits of pea plants by crossing tall pea plants (TT) and short pea plants (tt) to obtain offsprings that were all tall (Tt) in the first filial generation (F1).

This is possible because the allele for tallness is DOMINANT while the allele for shortness is RECESSIVE. This means that tallness allele (T) will mask the phenotypic expression of shortness allele (t) when in an heterozygous state (Tt) as in the F1 generation.