Ralph wanted to breed a pea plant that produced only purple flowers. He continued to breed purple-flower producing pea plants together over six generations. The results of Ralph's selective breeding are shown above. What did the selective breeding do to the population of pea plants?
A.
decreased its genetic diversity
B.
caused a pea plant to exhibit a new characteristic
C.
caused a new species of pea plant to form
D.
increased its genetic diversity

The answer is A