In snapdragons, flower color is determined by a gene that follows an incomplete dominance pattern. In this species, the red allele (R) produces red flowers, and the white (W) allele produces white flowers. The heterozygous individual produces a blended phenotype of pink flowers.

Question

If a red snapdragon is cross pollinated with a pink snapdragon, calculate the probability that the offspring will have white flowers.

(1 point)
Responses

25%
25%

50%
50%

0%
0%

100%

Answer 1

To determine the probability that the offspring will have white flowers from a cross between a red snapdragon (RR) and a pink snapdragon (RW), we can set up a Punnett square.

1. Parental Genotypes:

   • Red snapdragon: RR
   • Pink snapdragon: RW

2. Gametes:

   • The red snapdragon (RR) can only produce R gametes.
   • The pink snapdragon (RW) can produce R and W gametes.

3. Punnett Square:

   \[ \begin{array}{c|c|c} & R & R \ \hline R & RR & RR \ \hline W & RW & RW \ \end{array} \]

4. Offspring Genotypes:

   • 50% RR (red flowers)
   • 50% RW (pink flowers)

From the Punnett square, we see that there are no offspring with the genotype WW, which corresponds to white flowers.

Therefore, the probability that the offspring will have white flowers is 0%.