Question

3. In snapdragons, flower color is controlled by incomplete dominance. The two alleles are red
(R) and white (W). The heterozygous genotype is expressed as pink.

a) What is the phenotype of a plant with the genotype RR?

b) What is the phenotype of a plant with the genotype WW?

c) What is the phenotype of a plant with the genotype RW?​

Answer 1

Explanation:

The color of flowers in snapdragons show incomplete dominance

In snapdragons, flower color is controlled by incomplete dominance. The two alleles are red (R) and white (W). The heterozygous genotype is expressed as pink.

Answer 2

Snapdragon is an example of incomplete dominance. In incomplete dominance, the dominant and recessive traits are observed only in homozygous form. In heterozygous conditions, the trait displayed is neither dominant nor recessive. We observe the blending of the two traits. In snapdragon, the heterozygous blending results in pink color.

• a) Genotype RR: In homozygous condition, the plant will show dominant or recessive traits. Here the alleles are homozygous for the dominant trait. Hence the phenotype will be red.
• b) Genotype WW: The alleles are homozygous for a recessive trait. Therefore the phenotype will be white.
• c)Genotype RW: The alleles are heterozygous and in heterozygous conditions snapdragon shows incomplete dominance. The phenotype observed will be pink.