Problem:

A quinoa researcher is interested in the red variant of quinoa. She would like to determine if this variant is a Mendelian trait. She has taken a pure breeding red strain and crossed it with a pure breeding black strain. The resulting F1 plants are interbred with the following results.

Phenotype

Black Flower - 1593

Red Flower - 426

Total - 2019

Explain the following results and justify them.