NCERT Solutions for Class 10 Science Chapter 9 Heredity and Evolution
You need to be well prepared for Class 10 is Board exams. NCERT textbooks are recommended by CBSE and students need to study them necessarily. Thus, the students need to solve the exercises given at the end of each chapter. But, while solving them the students may face difficulty in getting the answers. At this point, we may help them with the solutions to these exercises. Our experts have made NCERT Solutions for Class 10 Science Chapter 9 – Heredity and Evolution for you. You can download it by clicking on the button below.
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CBSE Class 10 Science Chapter 9 NCERT Solutions
NCERT solutions for class 10 science chapter 9 – Heredity and Evolution explains the inheritance of the variations arising during the process of reproduction, heredity, determination of sex in different species, tracing the evolutionary relationships in the classification of organisms, Darwin’s Theory of Evolution, fossils, stages in evolution and evolution of humans. The NCERT solutions for class 10 science chapter 9 contains ample diagrams and pictures to explain all the concepts.
Sub-topics covered under NCERT Solutions for Class 10 Science Chapter 9
- 9.1 Accumulation of Variation during Reproduction
- 9.2 Heredity
- 9.2.1 Inherited Traits
- 9.2.2 Rules for the Inheritance of Traits – Mendel’s Contributions
- 9.2.3 How do these Traits get Expressed?
- 9.2.4 Sex Determination
- 9.3 Evolution
- 9.3.1 An Illustration
- 9.3.2 Acquired and Inherited Traits
- 9.4 Speciation
- 9.5 Evolution and Classification
- 9.5.1 Tracing Evolutionary Relationships
- 9.5.2 Fossils
- 9.5.3 Evolution by Stages
- 9.6 Evolution should not be equated with ‘Progress’
- 9.6.1 Human Evolution
NCERT Solutions for Class 10 Science Chapter 9
Q.1. A study found that children with light-colored eyes are likely to have parents with light-colored eyes. On this basis, can we say anything about whether the light eye color trait is dominant or recessive? Why or why not?
The information provided is insufficient to conclude anything. It is not possible to say whether the light colored is a dominant or recessive trait since the alleles are inherited from each parent. Unless we know the genotype of these variants of the trait, it is not possible to tell which is dominant or recessive. At least, three generations are required to come to any conclusion about the genotype of a particular trait.
Q.2. How are areas study of evolution and classification interlinked?
Organisms are classified into various groups on the basis of similarities and dissimilarities they share amongst each other. The more characteristics two species have in common, more closely they are related to each other. The closeness of two species indicates a common ancestor between them. Thus, the classification of species is a reflection of their evolutionary relationship.
Q.3. Explain the terms analogous and homologous organs with examples.
The structures that share a similarity in terms of their morphology, genetics, anatomy, embryology, may or may not have similar function but have the same origin are called homologous organs. For example, the forelimbs of humans and the wings of birds look different externally but their skeletal structure is similar. The structures that look similar superficially and are dissimilar anatomically but does the similar functions are called analogous structures. For example, the wings of birds and insects.
Q.4. Outline a project which aims to find the dominant coat color in dogs.
Coat color in dogs is governed by a variety of genes. At least 11 genes have been identified that influence the color of the coat in a dog. A dominant gene is a gene that is expressed in both homozygous as well as heterozygous conditions, whereas the recessive gene is only expressed in homozygous condition.
Let us consider, one parent is homozygous black (BB) and another parent is homozygous brown (bb). Cross between the two parents produces the offspring with the genetic make-up: Bb. Now we don’t know whether Black is dominant or brown is dominant. By observing the off-springs produced are we can say which one is a dominant trait. If the generation comprises of black we can say black is dominant and if it is brown then we can say brown is dominant.
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