Question 303 marksShort AnswerSection C

The gene combination of purple flowered pea plants is denoted as (WW) and that of white flowered pea plants as (ww), when these two plants are crossed F1F_1 generation is obtained. (a) List two observations made by Mendel in F1F_1 generation plants. (b) Give the (i) percentage of white flowered plants and (ii) ratio of the gene combinations WW, Ww and ww in F2F_2 generation. (c) Write one difference between dominant and recessive trait.

Heredity
Mendel's Experiments

Official answer

(a) Two observations made by Mendel in F1 generation plants are: (i) all plants were tall, and (ii) all plants had purple flowers. (b) (i) The percentage of white flowered plants in F2 generation is 25%. (ii) The ratio of the gene combinations WW, Ww, and ww in F2 generation is 1:2:1. (c) One difference between dominant and recessive trait is that dominant trait is expressed when an individual has one copy of the dominant allele, while recessive trait is expressed when an individual has two copies of the recessive allele.

Answer keywords:Mendel's experimentsF1 generationF2 generationgene combinations

Common mistakes

  1. 1.thinking that the F1 generation will be a mix of tall and short plants
  2. 2.thinking that the F2 generation will have a different ratio of gene combinations

Analysis and explanation

Mendel's experiments show that when purple flowered pea plants (WW) are crossed with white flowered pea plants (ww), the F1 generation will be all tall with purple flowers. The F2 generation will have a ratio of 1:2:1 for the gene combinations WW, Ww, and ww.

Interesting facts

Mendel's experiments were the first to demonstrate the principles of inheritance

the ratio of gene combinations in F2 generation is a fundamental concept in genetics

Question details

Q30 of 39 questions

Board
CBSE
Class
Class 10
Subject
Science
Year
2025
Section
Section C
Marks
3
Type
Short Answer
Chapter
Heredity
Topic
Mendel's Experiments
Bloom's level
Analyzing
Syllabus topic
Rules for the Inheritance of Traits

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Frequently asked questions

How many marks does this question carry in CBSE Class 10 Science 2025?

This question carries 3 marks in the CBSE Class 10 Science 2025 examination.

Which chapter does this question come from in Science?

This question is from the chapter "Heredity" in the CBSE Class 10 Science syllabus.

What topic does this question cover in Science?

This question covers the topic "Mendel's Experiments" from CBSE Class 10 Science.

What type of question is this in the CBSE Class 10 Science 2025 paper?

This is a Short Answer question from Section C in the CBSE Class 10 Science 2025 paper.