Question

In incomplete dominance, ratio of red: pink: white is

• A. 1:2:1
• B. 1:1:2
• C. 1:2:2
• D. 2:2:1

Answer 1

The correct option is A 1:2:1

Incomplete Dominance is the blending of alleles to create a phenotype that is a combination of both traits the alleles code for. Incomplete dominance is a type of non-Mendelian genetics.

For instance, snapdragon flowers can be either red, white, or pink. If they followed Mendel's inheritance patterns of simple dominance, the flowers would either be red or white in a 3:1 ratio. However, with snapdragon flowers, the ratio of red to pink to white is 1:2:1. This was Mendel's genotype ratio of homozygous dominant to heterozygous to homozygous recessive. This means that the heterozygous plant was actually blending the "dominant" and "recessive" alleles instead of the dominant trait completely masking the recessive trait in the phenotype of the plant. Thus, the correct answer is option A.