a plant can produce either purple flowers or white flowers. the purple flower color is dominant over the…

a plant can produce either purple flowers or white flowers. the purple flower color is dominant over the white flower color. what is the ratio of the offspring with purple flowers to the total number of offspring if two plants that are heterozygous for purple flowers are crossed?\no 1:4\no 2:4\no 3:4\no 4:4

a plant can produce either purple flowers or white flowers. the purple flower color is dominant over the white flower color. what is the ratio of the offspring with purple flowers to the total number of offspring if two plants that are heterozygous for purple flowers are crossed?\no 1:4\no 2:4\no 3:4\no 4:4

Answer

Answer:

C. 3:4

Explanation:

Step1: Define alleles

Let (P) be the dominant allele for purple flowers and (p) be the recessive allele for white flowers. Heterozygous plants have the genotype (Pp).

Step2: Set up Punnett - square

When two (Pp) plants are crossed, the possible gametes from each plant are (P) and (p). The Punnett - square has the following combinations:

(P) (p)
(P) (PP) (Pp)
(p) (Pp) (pp)

Step3: Determine genotypes and phenotypes

The genotypes of the offspring are (PP:Pp:pp = 1:2:1). Since (PP) and (Pp) result in purple - flowered plants (because (P) is dominant) and (pp) results in white - flowered plants, the number of purple - flowered plants is (3) (1 (PP) and 2 (Pp)) out of a total of (4) offspring. So the ratio of purple - flowered offspring to the total number of offspring is (3:4).