Question

why did gregor mendel choose to use purebred plants in his experiments?
they reproduce sexually.
they exhibit only one form of a trait.
they have a variety of traits.
they reproduce asexually.

Explanation:

Purebred plants (homozygous) have two of the same alleles for a particular trait. When they self - pollinate, they will always pass on the same form of the trait. This allows for more predictable and consistent results in genetic experiments. Sexual or asexual reproduction is not the key reason for choosing purebred plants in Mendel's experiments. Having a variety of traits would complicate the study of inheritance patterns.

Answer:

They exhibit only one form of a trait.