Pea plants produce either purple or white flowers with purple showing complete dominance. A gardener was given plants with purple flowers. Which of the following types of crosses would best allow her to determine the genotype of her plant in one generation?

Question

Quizplus · Accepted Answer

A testcross involves crossing the plant in question with a homozygous recessive plant (white flowers in this case) to determine the genotype of the unknown. If any offspring show the recessive phenotype (white flowers), the unknown parent must be heterozygous. This method directly addresses the question of genotype in one generation.

Pea Plants Produce Either Purple or White Flowers with Purple