Class 10 Science

Chapter 8 Solutions — Heredity

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Solutions

Overview

Step-by-step NCERT solutions for Heredity (Chapter 8, CBSE Class 10 Science) — the full working for every question, not just the final answer. You can also read the Heredity textbook chapter.

Solved

What these solutions cover

All 10 questions in Heredity are solved in the PDF. Here's what's inside, exercise by exercise:

Accumulation of Variation During Reproduction

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?
How does the creation of variations in a species promote survival?

Heredity — Rules of Inheritance and Sex Determination

How do Mendel's experiments show that traits may be dominant or recessive?
How do Mendel's experiments show that traits are inherited independently?
A man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits – blood group A or O – is dominant? Why or why not?
How is the sex of the child determined in human beings?

Chapter-end Exercises

1.
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, but almost half of them were short. This suggests that the genetic make-up of the tall parent can be depicted as
- (a) TTWW
- (b) TTww
- (c) TtWW
- (d) TtWw
A study found that children with light-coloured eyes are likely to have parents with light-coloured eyes. On this basis, can we say anything about whether the light eye colour trait is dominant or recessive? Why or why not?
Outline a project which aims to find the dominant coat colour in dogs.
How is the equal genetic contribution of male and female parents ensured in the progeny?

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