Question

Two pink coloured flowers on crossing resulted in 1 red, 2 pink and 1 white flower progeny. The nature of the cross will be:

• A. Double fertilisation
• B. Self pollination
• C. Cross pollination
• D. No fertilisation

Answer 1

The correct option is B

Self pollination

The correct option is B.

Explanation of the correct option:

1. Incomplete dominance results in F1 generation plants with all pink flowers when plants with pure red and white blooms cross.
2. These plants on self-pollination or fertilization produce progenies (F2 generation) with red, pink, and white flowers in 1:2:1 ratio.
3. This is a monohybrid cross as only one character or trait is involved in crossing.
4. The relationship between two genetic variants is referred to as dominant.
5. Each gene has two alleles that an individual inherits from each parent.
6. One allele of a gene, known as the dominant gene, will be expressed if the alleles are different.
7. The impact of the other allele, known as the recessive one, is concealed.

Explanation of the incorrect options:

Option A:

Double fertilization refers to the process of one male gamete fusing with the egg nucleus and another male gamete fusing with the polar nuclei or secondary nucleus resulting in the endosperm.

Option C:

The fusing of male and female gametes (sex cells) from separate individuals of the same species is known as cross-fertilization, also known as allogamy.

Final answer: Two pink colored flowers on crossing resulted in 1 red, 2 pink, and 1 white flower progeny. The nature of the cross will be self-pollination.