Question

The gene for flower color in snapdragons displays incomplete dominance. Snapdragons homozygous for the allele for red flower color have the genotype Fᴿ Fᴿ and have red flowers. Snapdragons homocygous for the allele for white flower color have the genotype FᵂFᵂand have white flowers. Heterozygous snapdragons, with the genotypo Fᴿ Fᵂ, have pink flowers. A snapdragon that has white flowers is crossed with a different snapdragon that has pink flowers. What percentage of the offspring is expected to have red, white, and pink flowers?

red flowers:_______%
white flowers:_______%
pink flowers:_______%

Answer 1

When a snapdragon with white flowers is crossed with a snapdragon with pink flowers, the percentage of offspring with red, white, and pink flowers is determined using a Punnett square.

Step-by-step explanation:

In this case, when a snapdragon with white flowers (genotype FᵂFᵂ) is crossed with a snapdragon with pink flowers (genotype FᴿFᵂ), the possible genotypes and phenotypes of the offspring can be determined using a Punnett square.

When the two genotypes are crossed, the possible genotypes of the offspring are FᵂFᵂ, FᵂFᴿ, and FᴿFᵂ. The corresponding phenotypes are white, pink, and pink.

So, the percentage of offspring with red flowers is 0%, the percentage of offspring with white flowers is 25%, and the percentage of offspring with pink flowers is 75%.

In incomplete dominance, the heterozygote phenotype (FRFW) is an intermediate of the homozygote phenotypes (FRFR for red and FWFW for white). Therefore, when FRFW is crossed with FWFW, there are two possible genotypes generated: FRFW and FWFW. Since red requires both alleles to be FR, and this cross does not produce FRFR, there will be no red-flowered offspring.