In pea plants, flowers are either white or purple; the purple color is produced by pigments called anthocyanins. The production of anthocyanins is a two-step process: the first is controlled by the C gene and the second by the P gene. Both genes must produce functional proteins for anthocyanin to be produced. For each gene, the dominant (C and P) alleles produce functional proteins. Which of the following genotypes will produce white (no pigment) flowers?
A)ccPP
B)CcPP
C)CCpp
D)ccPP and CcPP
E)ccPP and CCpp

Question

Quizplus · Accepted Answer

For anthocyanin to be produced, both the C and P genes must have at least one dominant allele. Genotypes ccPP and CCpp have at least one gene (C or P) completely recessive, meaning no functional protein for anthocyanin production is made, resulting in white flowers.

In Pea Plants, Flowers Are Either White or Purple; the Purple