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Chapters
1: Cell Cycle and Cell Division
2: Structure of Chromosome
▶ 3: Genetics
Unit 2: Plant Physiology
Chapter 4: Absorption by Roots
Chapter 5: Transpiration
Chapter 6: Photosynthesis
Chapter 7: Chemical Coordination in Plants
Unit 3: Human Anatomy and Physiology
Chapter 8: Circulatory System
Chapter 9: Human Excretory System
Chapter 10: Nervous System
Chapter 11: Sense Organs
Chapter 12: Endocrine System
Chapter 13: Reproductive System
Unit 4: Population
Chapter 14: Population
Unit 5: Human Evolution
Chapter 15: Human Evolution
Unit 6: Pollution
Chapter 16: Pollution
![Lakhmir Singh solutions for बायोलॉजी [अंग्रेजी] कक्षा १० आईसीएसई chapter 3 - Genetics - Shaalaa.com](/images/biology-english-class-10-icse_6:7181a54a5d284da8b50dd2f92022a1f6.jpg "Lakhmir Singh solutions for बायोलॉजी [अंग्रेजी] कक्षा १० आईसीएसई chapter 3 - Genetics")
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Solutions for Chapter 3: Genetics
Below listed, you can find solutions for Chapter 3 of CISCE Lakhmir Singh for बायोलॉजी [अंग्रेजी] कक्षा १० आईसीएसई.
Lakhmir Singh solutions for बायोलॉजी [अंग्रेजी] कक्षा १० आईसीएसई 3 Genetics Intex Quesions [Pages 36 - 45]
THINK AND ANSWER
Strands of DNA in each cell of your body is 6 feet (1 feet = 0.30 m = 30.48 cm).
Calculate the total length of all DNA strands if your body has 37.2 trillion cells.
TEST YOUR UNDERSTANDING - 1
True or False.
In a dihybrid cross, the genotype RRyy will represent round and yellow traits.
True or False.
The dominant gene is supressed by the recessive gene.
True or False.
Mendel experimented with many other types of plants.
Fill in the Blanks
The phenotypic ratio in a monohybrid cross between red and white flowers will be ______.
The gene pair that are not similar in an individual is called ______.
Multiple Choice Questions
When the first generation progeny cross among themselves to produce second generation progeny, the generation is known as ______.
F1 generation
F2 generation
F3 generation
Both F1 generation and F3 generation
Mendel named discrete units as ______.
genes
factors
alleles
chromosomes
TEST YOUR UNDERSTANDING - 2
True or False.
In a dissimilar pair of characters, both the traits express themselves.
True or False.
The dominant trait appears only in F2 generation in a cross between white and red flowers.
True or False.
Law of dominance explains the separation of gametes during fertilisation.
Fill in the Blanks
The concept of dominant and recessive alleles arises from ______.
In independent assortment, ______ of one pair of characters are ______ of characters at the time of gamete formation.
The scientific name of pea plant is ______.
The Law of Independent Assortment is based on ______ cross.
Multiple Choice Questions
Which of the following law is deduced from a dihybrid cross?
Law of Segregation
Law of Dominance
Law of Independent Assortment
Both law of segregation and law of dominance
In a dihybrid cross, genotype is ______.
1 : 2 : 2 : 6 : 1 : 2 : 1 : 2
1 : 2 : 2 : 3 : 1 : 2 : 1 : 2 : 2
9 : 3 : 3 : 1
1 : 2 : 2 : 4 : 1 : 2 : 1 : 2 : 1
There are ______ laws of Mendel.
1
2
3
4
THINK AND ANSWER
What were the drawbacks of Mendel's experiments?
Name two scientists who worked on chromosomes.
Who discovered DNA fingerprinting in India?
Why did Arun Kumar Sharma receive the Om Prakash Bhasin award and the Shanti Swarup Bhatnagar Prize?
TEST YOUR UNDERSTANDING - 3
True or False.
In females, ovum contain XY chromosomes.
True or False.
With the help of Punnett Square, gametes produced by parents can easily be identified.
Fill in the Blanks
The study of inheritance of characters (traits) is called ______.
______ is a sequence of nucleotide in the genetic material which codes for a particular protein.
Multiple Choice Questions
Haemophilia is based on ______.
Law of Segregation
Law of Dominance
X-linked genes
Chromosome
Sex-linked diseases are more prominent in men because ______.
they have more number of genes
their genes are dominant
they have less number of genes
their genes are recessive
Lakhmir Singh solutions for बायोलॉजी [अंग्रेजी] कक्षा १० आईसीएसई 3 Genetics EXERCISE [Pages 47 - 49]
Objective Questions
True or False.
The law of dominance was given by De Vries and Correns.
True or False.
The ratio 9 : 3 : 3 : 1 was obtained in a monohybrid cross.
True or False.
Mendel selected golden pea for his experiments.
True or False.
In Mendel's experiment, pod shape was round and elongated.
True or False.
In Mendel's experiment the genotype of dihybrid cross ratio was 9 : 3 : 3 : 1.
True or False.
Colour blindness is X-linked whereas haemophilia is Y-linked disease.
Fill in the Blanks
Mendel selected ______ for his experiments on heredity.
______ contrasting characters were selected by Mendel for his experiments.
The phenotypic ratio in F1 generation in monohybrid cross was ______.
Mother is a ______ carrier of colour blindness disease.
In a monohybrid cross, the genotypic ratio is ______.
Match the Following.
| Column I | Column II |
| (i) Homozygous | (a) Tt |
| (ii) Heterozygous | (b) TT |
| (iii) Homozygous Dominant | (c) TT |
| (iv) Heterozygous Dominant | (d) Tt |
| (v) Autosomes | (e) XY |
| (vi) Sex chromosomes | (f) 22 pairs |
Give One Word Answer.
Name the small part of DNA that codes for proteins.
Give One Word Answer.
The name given to chromosomes XY and XX.
Give One Word Answer.
The person known as the Father of Genetics.
Give the names of the scientists who rediscovered Mendelism.
Give One Word Answer.
An allele that does not express when present along with a dominant allele.
Give One Word Answer.
The chromosome responsible for male sex in humans.
Multiple Choice Questions
Mendel thought that the characteristics of pea plants are determined by the ______.
inheritance of units or factors from both parents
inheritance of units or factors from one parent
relative health of the parent plants at the time of pollination
none of the above
An allele is ______.
different word for a gene
a homozygous genotype
a heterozygous genotype
one of the several possible forms of a gene
In a monohybrid cross between two heterozygous individuals, percentage of pure homozygous individuals obtained in F1 generation will be ______.
25%
50%
75%
100%
A cross between two tall plants resulted in offspring having few dwarf plants. What would be the genotypes of both the parents?
Tt and Tt
TT and Tt
TT and TT
Tt and tt
In a dihybrid cross, if you get 9:3:3:1 ratio it denotes that ______.
The allels of two genes are segregating independently
It is a case of multiple allelism
It is a multigenic inheritance
The allels of two genes are interacting with each other
The characters which appear in the F1 generations are called ______.
recessive characters
dominant characters
both recessive and dominant characters
none of these
In the F2 generation of a Mendelian dihybrid cross the number of phenotypes and genotypes are ______.
phenotypes - 4; genotypes - 16
phenotypes - 9; genotypes - 4
phenotypes - 4; genotypes - 8
phenotypes - 4; genotypes - 9
Out of seven contrasting pairs, the colour-based contrasting traits studied by Mendel in pea plant were:
Seed
Flower
Pod
All of these
The number of contrasting traits studied by Mendel in pea plants were:
6
7
8
10
Genes which code for a pair of contrasting traits are known as ______.
linked genes
alleles
dominant genes
recessive genes
Colour blindness is a ______ disease which causes inability in a person to distinguish different colours.
sex-linked dominant
sex-linked recessive
sickle cell anaemia
Down's syndrome
Descriptive Questions Short Answer Questions
Define Mendel's law of dominance.
What is sex chromosomes?
Briefly explain the following term:
Monohybrid cross
State Mendel’s Law of Segregation.
Solutions for 3: Genetics
Lakhmir Singh solutions for बायोलॉजी [अंग्रेजी] कक्षा १० आईसीएसई chapter 3 - Genetics
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