MCQ Genetics 2025 exam

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NEET MCQ Principle of Inheritance & Variations for 2025

Here we have compiled a list a MCQs about chapter Principle of Inheritance and Variations.

Principal’s Genetics is one of the most important chapters of Class 12 Biology. Every year in the board exams and NEET exams, as well as in other competitive exams where questions come from Biology, many questions are asked from this chapter.

If the practice of these questions is good then we can get very good marks.

Click here for important MCQ of Sexual reproduction in Flowering Plants

And you can qualify for the competition.

If seen from this perspective, then Principle of Inheritance and Variation chapter is a very important chapter.

We hope that you will solve the given questions correctly and if you like it, then share it with other students too. May your online journey be good.

Thank you.

This List of MCQ (Principle of Inheritance and Variations) Genetics tries to cover almost every topics related to this chapter. So let’s do this.

NEET MCQ Principle of Inheritance & Variations

MCQ of Principle of Inheritance & Variations

1 / 25

Genes which are located only in the Y-chromosome are known as

holandric genes

epistatic genes

antiepistasis genes

Operator genes

2 / 25

Down's syndrome is associated with trisomy of chromosome number

3 / 25

An abnormal human baby with 'XXX' sex chromosomes was born due to

Formation of abnormal ova in the mother.

Fusion of two ova and one sperm.

Formation of abnormal sperms in the father.

Fusion of two sperms and one ovum.

4 / 25

Select the correct option for Filial-1 generation regarding Mendelian inheritance

Its phenotype is intermediate of both the parents

It may be hybrid or may be pure line

It is pure breeding line

It is first hybrid generation

5 / 25

Given below are few statements regarding the Mendel’s experimental investigations on laws of inheritance. Choose the incorrect statement

Mendel conducted artificial/cross pollination experiments using several true breeding pea lines.

Initially he took 34 pairs of varieties of pea plants, then 22, but ultimately worked with only 7 pairs of varieties.

Out of the seven pairs of contrasting characters studied by Mendel, the number of seed based characters are four.

During the experiments, Mendel called genes by the term ‘factors’.

6 / 25

A white colour flower is found to be dominant over violet colour flower. The genotype of white flower can be determined by

Monohybrid cross

Back cross

Dihybrid cross

Test cross

7 / 25

Pure line breed refers to

recombinations

heterozygosity

homozygosity

both homozygous and heterozygous

8 / 25

What were the phenotypes F2 generation plants obtained by selfing of heterozygous tall F1 plants in Mendel’s monohybrid cross?

¼ tall and ¾ dwarf

All tall

¼ dwarf and ¾ tall

¼ tall, 2/4 intermediate and ¼ dwarf

9 / 25

Which one of the following statements is relevant to sex linked characters?

They generally follow Criss-cross inheritance

They are mostly present on Y chromosome

They are only present on X chromosome

They do not follow Criss-cross inheritance

10 / 25

What were the genotypes F2 generation plants obtained by selfing of heterozygous Violet Flowers F1 plants in Mendel’s monohybrid cross?

All violet

1/4 white and 3/4 violet

1/4 violet and 3/4 white

1/4 pure violet, 2/4 hybrid violet and 1/4 white

11 / 25

A human female with Turner's syndrome

is able to produce children with normal husband.

exhibits male character

has one additional X-chromosome.

has 45 chromosomes with XO.

12 / 25

Three children in a family have blood types O, AB and B respectively. What are the genotypes of their parents?

IAi and IBi

IAIA and IBi

IAIB and ii

IBIB and IAIA

13 / 25

The disorder caused by point mutation is

Sickle Cell anemia

Tetany

Turner's syndrome

Down's syndrome

14 / 25

A pleiotropic gene

Is the gene evolved during Pliocene

Is expressed only in primitive plants

Controls multiple traits in an individual

Control a trait only in combination with another gene

15 / 25

Read the following statements and choose the correct option.

Statement A: The law of segregation is the most fundamental principle of heredity that has universal application with no exception.

Statement B: The law of segregation is also called law of purity of gametes/ spores as segregation of two alleles of a trait results in gamete/ spores receiving only one allele out of a pair.

Statement A is correct but statement B is incorrect

Both statements A and B are incorrect

Both statements A and B are correct

Statement A is incorrect but statement B is correct

16 / 25

Which of the following pairs of contrasting traits were studied in pea plant by Mendel constitute recessive characters?

Yellow seed and yellow pod

White flowers and yellow seeds

Constricted pod and green seeds

Green pod and dwarf plants

17 / 25

The F1 of genotype Tt were self-pollinated. The resultant F2 plants appear to be both tall and dwarf in the phenotypic ratio 3:1. What would be the genotypic ratio of the F 2 generation plants?

2:1:1

1:3:1

1:2:1

1:1:2

18 / 25

Syndrome in humans in which individual's somatic cells contain the three sex chromosomes XXY is called

Klinefelter's syndrome

Turner's syndrome

Super female

Down's syndrome

19 / 25

If a homozygous tall plant is crossed with homozygous dwarf plant, the off springs will be

half tall plants

all tall plants

half dwarf plants

all dwarf plants

20 / 25

Mating of an organism to a double recessive in order to determine whether it is homozygous or heterozygous for a character under consideration is called

reciprocal cross

dihybrid cross

back cross

test cross

21 / 25

How many different types of gametes can be formed by F1 progeny, resulting from the following cross TtRr?

22 / 25

In a dihybrid cross, when a heterozygous pea plant with green inflated pod are self-crossed. The off spring plant with green constricted pod are represented by the genotype

GgIi, GgII, GGIi

Ggii, GGii

ggIi, ggII

Ggii,GGii, ggii

23 / 25

The nuclear structure observed by Henkings in 50% of the insect sperm after spermatogenesis was

Y-chromosome

Nucleolus

X-body

autosome

24 / 25

In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in F1 generation all pink flowers were obtained. When pink flowers were selfed, the F2 generation showed white, red and Pink flowers. Choose the incorrect statement from the following.

Pink flower in F1 is due to incomplete dominance

Ratio of F2 is 1/4 (red): 2/4 (pink) : 1/4 (white)

Law of segregation does not apply in this experiment

This experiment does not follow the principle of dominance

25 / 25

Identify the correct order of organisation of genetic material from largest to smallest

Chromosome, gene, genome, nucleotide

Genome, chromosome, nucleotide, gene

Genome, chromosome, gene, nucleotide

Chromosome, genome, nucleotide, gene

Your score is

The average score is 30%

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NEET MCQ Principle of Inheritance & Variations for 2025

NEET MCQ Principle of Inheritance & Variations

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