Mendal selected pea plant for his breading, because this plant is characterized by easy pollination..
It is easy to know the properties of this plant and study them well.
And also because this plant is a bisexual plant.
This plant has a short lifespan, so it is easier to maintain.
And because this type of plant during the formation of gametes has a set of individual features and each type of pair is independent by itself, and this law does not apply to linked genes.