Question

Explain incomplete dominance, using snapdragon flowers as an example

Answer 1

Answer:

Incomplete dominance is a type of interaction takes between two different alleles of a gene in which one allele can not express itself completely over the other allele.

It results in the production of third phenotype which is usually the intermediate of the two parental traits.

For example, when plant bearing red colored (dominant trait) snapdragon flower is crossed with the plant having white (recessive trait) flowers, it resulted in the production of the plants with pink flowers (intermediate of red and white).

When pink flowered plants were crossed they resulted in the production of plants with three types of phenotype.

The genotype and phenotype ratio were same: 1 (RR, red) : 2 (Rr, pink) : 1 (rr, white).

Answer 2

Incomplete dominance (also called partial dominance or semi-dominance) occurs when the phenotype of the heterozygous phenotype is distinct from and often intermediate to the phenotypes of the homozygous phenotypes. For example, the snapdragon flower color is homozygous for either red or white.