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%

0%
0%

100%
100%

50%

Answer 1

To determine the probability of offspring having white flowers from a cross between a red snapdragon and a pink snapdragon, we first need to identify the genotypes of the parents.

• The genotype of the red snapdragon is RR (homozygous red).
• The genotype of the pink snapdragon is RW (heterozygous).

Now, let's set up a Punnett square to visualize the possible genotypes of the offspring:

       R      R
      ___________
   R |   RR   |   RR   |
      |--------|--------|
   W |   RW   |   RW   |
      |________|________|

From this Punnett square, we can see the possible genotypes of the offspring:

• 2 RR (red flowers)
• 2 RW (pink flowers)

Thus, there are no genotypes that produce white flowers (WW).

Calculating the probability:

• The probability of getting white flowers (WW) = 0 out of a total of 4 possible offspring.

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