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 identical alleles for a trait. When self - pollinated, they pass on the same form of the trait to offspring. This allows for clear and predictable results in genetic experiments. Sexual or asexual reproduction is not the key reason for choosing purebreds in Mendel's work. Having a variety of traits would complicate the study of single - trait inheritance patterns.

Answer:

They exhibit only one form of a trait.