NCERT Solutions for Class 10 Science Chapter 8 Heredity
NCERT Solutions for Class 10 Science Chapter 8 Heredity provides a comprehensive guide to understanding how traits are passed from one generation to the next, Mendel's laws of inheritance, and the mechanism of sex determination in human beings.
Overview of Topics & Subtopics
Intext Questions
Q1: If a trait A exists in 10% of a population of an asexually reproducing species and a trait B exists in 60% of the same population, which trait is likely to have arisen earlier?
Answer: Trait B is likely to have arisen earlier. In an asexually reproducing species, variations occur naturally over time and are passed down to offspring. Since trait B is present in a larger percentage of the population (60%), it means it has been accumulating and passing down for a much longer period compared to trait A (10%).
Q2: How does the creation of variations in a species promote survival?
Answer: Variations help a species adapt to drastic changes in their environment, such as changes in temperature, water levels, or the introduction of new predators. Individuals with favorable variations are more likely to survive these harsh changes and reproduce, ensuring the survival of the species as a whole.
Q3: How do Mendel's experiments show that traits may be dominant or recessive?
Answer: Mendel crossed pure tall pea plants (TT) with pure short pea plants (tt). In the first generation (F1), all the plants produced were tall (Tt), showing that the tall trait is dominant and the short trait is recessive (it remained hidden). However, when the F1 plants were self-pollinated, the F2 generation produced tall and short plants in a 3:1 ratio, proving the recessive trait was still present and could be expressed in subsequent generations.
Q4: How do Mendel's experiments show that traits are inherited independently?
Answer: Mendel performed a dihybrid cross by taking two pairs of contrasting characteristics, such as seed shape (Round/Wrinkled) and seed color (Yellow/Green). When he crossed plants with round-yellow seeds and wrinkled-green seeds, the F2 generation produced new combinations like round-green and wrinkled-yellow seeds. This proved that the traits for seed shape and seed color separate and are inherited independently of each other.
Textbook Chapter End Exercise Questions
Q1: A Mendelian experiment consisted of breeding tall pea plants bearing violet flowers with short pea plants bearing white flowers. The progeny all bore violet flowers, butHere is the complete HTML file updated for **Class 10 Science Chapter 8: Heredity**. The structure, styling, footer, and sidebar remain exactly as you provided, with the active state moved to Chapter 8 and the content replaced with the relevant NCERT questions and topics.
```html
NCERT Solutions for Class 10 Science Chapter 8 Heredity
How to use these notes
These notes are designed for quick revision and should be used alongside the textbook. Read the chapter once for full understanding, then return here to recall definitions, formulas, key ideas and important examples.
Topics covered on this page
- Overview of Topics & Subtopics
- Intext Questions
- Textbook Chapter End Exercise Questions
Quick revision tip
Finish one small section, close the page for a moment, and try to recall the main points in your own words. Then check the page again. This simple recall step can make revision more active.
Read More & Chapter Resources
These short notes are designed for quick revision. Read the main points once, then use the related material below to practise the same chapter. Revising a concept and checking it with questions can make your preparation more focused.
Continue with this chapter
You May Also Read
