Question

One species of plant produces blue, light blue, and white flowers. To determine the inheritance pattern, the following matings were performed:

blue x blue to blue

white x white to white

blue x white to light blue

This example represents a pattern: (choose the best option)

a. Associated with the X chromosome

b.Incomplete Dominance

c. Codominance

d.Mendelian

Answer 1

Ans. (c) Codominance

In the above question the species of plant produces Blue, Light blue and White flowers. Mating between the plants were done in order to identify the inheritance patternt

As shown: According to Mendel cross

White x white = white progeny

So both parents are homozygous as all progeny shows white color

Blue x blue = blue progeny

Here also both parents are homozygous as all the progeny shows blue color flower

thus,

Let blue be 'ww' and white be 'WW'

white x blue = light blue

here when both color plant are crossed it gives out the 3rd color which is light blue.

This sitiation lead to codominance of the character as if 2 allele are homozygous it shows the true breeding trait but when the alleles are different hence heterozygous, apart from showing the dominant trait it shows some other trait that must resemble either both parents or none.

Codominance is relation between 2 version of genes, wherein the alleles of a gene pair in a heterozygote are fully expressed and each version of gene makes a slightly different protein.