Dr. Josh is a scientist who studies the genetic traits of plants. He prefers growing plants though pollination, a form of sexual reproduction, rather than growing them from cuttings. Why does he prefer this method?

Pollination provides more genetic variation

Pollination is a form of sexual reproduction and adds new gene combination to the progeny. These new gene combinations impart new genetic traits to progeny.

Explanation:

Pollination includes landing of pollen on the stigma of the same flower or another flower of same species. Since it is followed by fusion of male and female gamete to form an embryo, new gene combination and new genetic traits are imparted to the progeny.

Since the Dr studies genetic traits, sexual reproduction in the plant would allow him to observe more genetic variations in the traits.