Point out any three importance of variations.

List out the reasons for the selection of pea plant by Mendel.

State the law of segregation.

How many types of gametes are produced by heterozygous dihybrid plant with a genotype RrYy? Write them.

Define trihybrid cross. Mention its F ₂ phenotypic ratio.

Define co-dominance. How it is proved by using Gossypium species?

Give an account on cytoplasmic male sterility.

Write a short notes on Atavism.

A yellow colour flower plant indicated by YY is crossed with white color flower plant denoted by yy.
(a) following the Mendelian inheritance pattern, what would be the flower color is first filial generation?
(b) Which Mendelian principle is illustrated in this cross?
(c) Derive the cross and state the phenotypic ratio of yellow flowers to white flowers in F₂ generation?

Mala is a genetic research student. She was given a plant to identify whether it is a homozygous or heterozygous for a particular trait. How will she proceed further?

In the chart given below, 'AA' are the genes located in a chromosome of Pisum sativum.
Observe the chart and mention the genetic phenomenon does it indicates.

Give the F₂ phenotypic ratio of
a) Supplementary genes
b) Complementary genes
c) Dominant epistasis

Name the respective pattern of inheritance where F ₁ phenotype
a) resembles anyone of the two parents
b) is an intermediate between two parental traits.

Explain Reciprocal cross with an example.

Write a note on test cross.