AP BIOLOGY

Detailed explanation-1: -Answer and Explanation: In this situation, every offspring produced from this cross with be a heterozygote (Pp), and because purple is dominant to white, all the offspring will be purple. Therefore, the probability of an offspring having white flowers is zero.

Detailed explanation-2: -There was a 3:1 ratio of purple:white flowers in generation F2 because the “masked” (recessive) genes from the F1 generation were allowed to pair, however they were only allowed to pair one time leaving the other three times to appear with purple flowers.

Detailed explanation-3: -The F1 generation is 100% Pp. The F2 generation is 25% PP (homozygous dominant, purple flowers), 50% Pp (heterozygous, purple flowers), and 25% pp (homozygous recessive, white flowers). This is how the white characteristic reappears in the second generation. The phenotype is 3:1, purple to white.

Detailed explanation-4: -The physically observable translation of a genotype is called the phenotype. For example, a pea plant with the genotype big-P-big-P has the purple flowers phenotype, while a plant that’s small-p-small-p has white flowers. Generally speaking, true-breeding strains are homozygous.