A trait that manifests itself in first generation hybrids when crossing pure lines. An example of such a feature

A trait that manifests itself in first generation hybrids when crossing pure lines. An example of such a feature is from the result of Mendel’s experiments with peas.

To answer this question, let us turn to Mendel’s first law – the law of uniformity of the first generation hybrids. Let’s say we have peas with a yellow color, as well as peas with a green color. Yellow color in peas is the dominant trait, and green is recessive. Each pea has only one trait, so when crossing we get peas with a yellow color – with a dominant trait. It looks like this:
A – dominant trait, and – recessive trait
p ♀AA ♂aa
G ♀ A ♂ a
F1 Aa