Answer;
D.They reproduce sexually and have many traits that are easy to observe.
Explanation;
Gregor Mendel, who is considered to be the father of genetics, chose the pea plants for his experiments because the garden pea is an ideal subject in the study of genetics. The garden pea had the following characteristics which made it ideal for the experiments;
- Pea plants were sexually reproducing with bisexual flowers
- self pollination and self fertilization was possible
- the life cycle was completed in one season
- hybrids were perfectly fertile
- many varieties with well-defined characters were available i.e. presence of seven pairs of contrasting or allelomorphic characters