A Mendelian experiment consisted of breeding pea plants bearing violet flowers with pea plants bearing white flowers. What will be the result in F₁ progeny?
A Mendelian experiment consisted of breeding pea plants bearing violet flowers with pea plants bearing white flowers. What will be the result in F₁ progeny?
Official answer
In the progeny, all the plants will bear violet flowers. This is because violet flower color is the dominant trait, which completely masks the expression of the recessive white flower color trait in the heterozygous state.
Marking scheme
- 1.Stating that all progeny will bear violet flowers. (0.5 marks)
- 2.Reasoning that violet is the dominant trait and white is the recessive trait. (0.5 marks)
Hint
Think about which flower color trait is dominant in garden pea plants according to Mendel's observations.
Quick oral answer
All the progeny will have violet flowers because violet is the dominant trait, which suppresses the expression of the recessive white trait.
Common mistakes
- 1.Expecting a blend or intermediate color (like pink or light violet), which does not occur in Mendelian single-gene inheritance.
- 2.Incorrectly identifying white as the dominant trait.
Analysis and explanation
In Mendel's experiments, crossing parents with contrasting characters (homozygous dominant violet flowers, represented as , and homozygous recessive white flowers, represented as ) results in progeny that are all heterozygous (). Since there are no 'halfway' or intermediate characteristics in the generation, only the dominant trait (violet color) is expressed, while the recessive trait (white color) remains unexpressed.
Interesting facts
Mendel's choice of garden peas (Pisum sativum) was brilliant because they have clear, contrasting, and easily observable traits with no intermediate forms in the generation.
Question details
Q1 of 27 questions
- Board
- CBSE
- Class
- Class 10
- Subject
- Science
- Year
- 2018
- Section
- Section A
- Marks
- 1
- Type
- Short Answer
- Chapter
- Heredity
- Topic
- Rules for the Inheritance of Traits – Mendel's Contributions
- Bloom's level
- Understanding
- Syllabus topic
- Mendelian inheritance; Laws of inheritance of traits
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Frequently asked questions
How many marks does this question carry in CBSE Class 10 Science 2018?
This question carries 1 mark in the CBSE Class 10 Science 2018 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 "Rules for the Inheritance of Traits – Mendel's Contributions" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2018 paper?
This is a Short Answer question from Section A in the CBSE Class 10 Science 2018 paper.