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

0%
0% - no response given

100%
100% - no response given

25%
25% - incorrect

50%

Answer 1

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

1. The red snapdragon has the genotype RR (red).
2. The pink snapdragon has the genotype RW (pink).

Now, we can set up the Punnett square:

      R    |    R
-----------------
  R |  RR   |  RR  
-----------------
  W |  RW   |  RW   

The possible genotypes of the offspring are:

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

Since there are no W alleles present in the red x pink cross, there is a 0% chance of producing a homozygous white (WW) flower from these parents.

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