Question map
Not attempted Correct Incorrect ★ Bookmarked
Loading…
Q14 (CDS-II/2021) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Genetics and evolution Answer Verified

In pea, a pure tall plant (TT) is crossed with a short plant (tt). What will be the ratio of pure tall plants to short plants in the F2 generation ?

Result
Your answer: —  Â·  Correct: A
Explanation

In a Mendelian monohybrid cross, crossing a pure tall plant (TT) with a short plant (tt) produces an F1 generation that is entirely heterozygous (Tt). When these F1 plants self-pollinate (Tt x Tt), the F2 generation follows a specific genotypic ratio of 1:2:1. This ratio represents 1 homozygous dominant (TT), 2 heterozygous (Tt), and 1 homozygous recessive (tt). In this context, 'pure tall' refers to the homozygous dominant (TT) genotype, and 'short' refers to the homozygous recessive (tt) genotype. According to the genotypic ratio, there is 1 TT plant for every 1 tt plant in the F2 generation. Therefore, the ratio of pure tall plants (TT) to short plants (tt) is 1:1. This is distinct from the 3:1 phenotypic ratio, which groups TT and Tt together as tall.

How others answered
Each bar shows the % of students who chose that option. Green bar = correct answer, blue outline = your choice.
Community Performance
Out of everyone who attempted this question.
100%
got it right
✓ Thank you! We'll review this.

SIMILAR QUESTIONS

CAPF · 2025 · Q59 Relevance score: -3.60

A point P on the ground is on the same line as the bases and the tips of a pair of trees A and B such that P is on the left of both these trees. The ratio of heights of A and B is 1:3. If the distance between P and A is a metre, then the distance between A and B, in metre, is

IAS · 2024 · Q19 Relevance score: -3.91

Consider the following plants : 1. Groundnut 2. Horse-gram 3. Soybean How many of the above belong to the pea family ?

CDS-II · 2019 · Q17 Relevance score: -4.89

Marsika, Fern and Horse-tall are examples of which one of the following plant groups?

CAPF · 2022 · Q16 Relevance score: -4.92

One way of incorporating desired characters into crop varieties is hybridization. In this process, there is crossing between genetically dissimilar plants. Which one of the following crossings will not refer to hybridization?