${{\rm{F}}_1}$crossed with heterozygous parent

${{\rm{F}}_1}$ crossed with homozygous dominant parent

${{\rm{F}}_1}$ crossed with homozygous parent

Back to PRINCIPLE OF INHERITANCE AND VARIATION

Your Progress

0 / 365 Answered

Correct

Incorrect

Accuracy

NEET • BIOLOGY • PRINCIPLE OF INHERITANCE AND VARIATION

Principle of inheritance and variation practice · Mixed difficulty

Choose an answer to check it, or open “View answer” to study the explanation. Sign in to save progress to your account.

Practice format and chapter quiz

The practice player uses single-correct-answer MCQs. Chapter quizzes help you review a topic; they are not full-length NEET mock papers.

Take a chapter quiz →

Showing 1-30 of 365 questions

Preparing practice and saved progress…

1 Easy

1 of 365

Understanding +4 | -1

A woman has an X-linked condition on one of her

\mathrm{X}

chromosomes. This chromosomes can be inherited by

View answer and explanation

Correct option: A

Both sons and daughters

Option A (Both sons and daughters) is correct because a woman passes one of her X chromosomes to each of her children, regardless of their sex.

2 Medium

2 of 365

Understanding +4 | -1

Some individuals with blood group –A may inherit the genes for blonde hair, while other individuals with blood group – A may the gene for brown hair. This can be best explained by the principle of

View answer and explanation

Correct option: C

Independent assortment

Option C (Independent assortment) is correct because the inheritance of blood group A and hair color are independent events, as stated by the principle of independent assortment.

3 Easy

3 of 365

Application +4 | -1

On crossing two heterozygous tall plants (Tt), and total of 500 plants were obtained in

{F_1}

generation. What will be the respective number of tall and dwarf plants obtained in

{F_1}

generation?

View answer and explanation

Correct option: A

375, 125

Option A (375, 125) is correct because in a cross between two heterozygous tall plants (Tt x Tt), the expected phenotypic ratio is 3:1 (Tall: Dwarf).

4 Medium

4 of 365

Remembering +4 | -1

Colourblindness is caused due to

View answer and explanation

Correct option: A

Recessive female chromosome

Option A (Recessive female chromosome) is correct because colorblindness is typically caused by a recessive gene located on the X chromosome, which is a female chromosome.

5 Easy

5 of 365

Remembering +4 | -1

Syndrome stands for

View answer and explanation

Correct option: A

A group of symptoms

Option A (A group of symptoms) is correct because a syndrome is defined as a collection of signs and symptoms that characterize a particular condition.

6 Hard

6 of 365

Remembering +4 | -1

In phenylketonuria mental retardation takes place due to accumulation of

View answer and explanation

Correct option: C

Phenylpyruvic acid

Option C (Phenylpyruvic acid) is correct because in phenylketonuria, mental retardation occurs due to the accumulation of phenylpyruvic acid.

7 Medium

7 of 365

Understanding +4 | -1

Test cross is when

View answer and explanation

Correct option: C

{\mathrm{F}_1}

crossed with homozygous recessive parent

Option C (

{\mathrm{F}_1}

crossed with homozygous recessive parent) is correct because a test cross involves crossing the F1 generation with a homozygous recessive parent to determine the genotype of the F1.

8 Medium

8 of 365

Remembering +4 | -1

Haemophilia, a X-linked recessive disease is caused due to deficiency of

View answer and explanation

Correct option: C

Lack of clotting material and vitamin-K

Option C (Lack of clotting material and vitamin-K) is correct because hemophilia is caused by a deficiency in blood clotting factors, and vitamin K is essential for their synthesis.

9 Medium

9 of 365

Application +4 | -1

Which of the following crosses would produce a genotypic ratio of 1 : 2 : 1 in

{F_2}

View answer and explanation

Correct option: C

Ab \times Ab

Option C (

Ab \times Ab

) is correct because a cross between two heterozygotes for a single gene will result in a 1:2:1 genotypic ratio.

10 Medium

10 of 365

Remembering +4 | -1

When different alleles of the same gene are present on an individual, the individual is a

View answer and explanation

Correct option: C

Homozygous

Option C (Homozygous) is correct because when different alleles of the same gene are present on an individual, the individual is a heterozygous, not homozygous.

11 Medium

11 of 365

Application +4 | -1

Pure tall pea plant with round seeds is crossed with pure dwarf pea plant with wrinkled seeds. The probability of genotype ttRR in

F_2

generation is

View answer and explanation

Correct option: A

\frac{1}{16}

Option A (

\frac{1}{16}

) is correct because in a dihybrid cross, the probability of obtaining a specific homozygous recessive genotype (ttRR) is (1/4)*(1/4) = 1/16.

12 Easy

12 of 365

Remembering +4 | -1

Sex chromosomes are also known as

View answer and explanation

Correct option: B

Allosomes

Option B (Allosomes) is correct because sex chromosomes are also known as allosomes.

13 Easy

13 of 365

Remembering +4 | -1

If genes of an allelic pair are not-same. This condition is called

View answer and explanation

Correct option: B

Heterozygous

Option B (Heterozygous) is correct because heterozygous refers to a condition where the genes of an allelic pair are not the same, meaning the individual has two different alleles for a particular trait.

14 Hard

14 of 365

Application +4 | -1

Calculate number of the phenotypes in

\mathrm{F}_2

generation if a character is controlled by 3 pairs of polygenes.

View answer and explanation

Correct option: A

Option A (7) is correct because the number of phenotypes in the F2 generation for a character controlled by n polygenes is 2n+1. In this case, n=3, so 2(3)+1 = 7.

15 Medium

15 of 365

Understanding +4 | -1

Frameshift mutation and base pair substitution changes the

View answer and explanation

Correct option: B

Nucleotide sequence

Option B (Nucleotide sequence) is correct because frameshift mutations and base pair substitutions directly alter the order of nucleotides in the DNA or RNA.

Explore Other Chapters in BIOLOGY

View All →

ANIMAL KINGDOM 756 MCQs PLANT KINGDOM 415 MCQs ANATOMY OF FLOWERING PLANTS 404 MCQs MOLECULAR BASIS OF INHERITANCE 404 MCQs CHEMICAL COORDINATION AND INTEGRATION 387 MCQs EVOLUTION 362 MCQs

16 Medium

16 of 365

Understanding +4 | -1

In case of incomplete dominance, what will be the phenotypic ratio of

{F_2}

generation?

View answer and explanation

Correct option: C

0.04306713

Option A (0.042361111) is incorrect. The phenotypic ratio for F2 generation in incomplete dominance is 1:2:1, not a decimal value. The correct answer should be a ratio.

17 Medium

17 of 365

Understanding +4 | -1

Genotype is the

View answer and explanation

Correct option: B

Genetic constitution of the phenotype

Option B (Genetic constitution of the phenotype) is correct because the genotype is the genetic constitution that underlies the phenotype.

18 Easy

18 of 365

Remembering +4 | -1

Sudden and heritable change in a character of an organism is called

View answer and explanation

Correct option: A

Mutation

Option A (Mutation) is correct because a mutation is defined as a sudden and heritable change in the genetic material of an organism.

19 Medium

19 of 365

Remembering +4 | -1

The phenomenon of a single gene regulating several phenotypes is called

View answer and explanation

Correct option: D

Pleiotropism

Option D (Pleiotropism) is correct because pleiotropism describes a single gene influencing multiple phenotypic traits.

20 Easy

20 of 365

Remembering +4 | -1

The chromosomal number in the meiocytes of housefly is

View answer and explanation

Correct option: B

Option B (12) is correct because the housefly has a diploid chromosome number of 12, meaning its meiocytes (cells undergoing meiosis) also have 12 chromosomes.

21 Hard

21 of 365

Remembering +4 | -1

The term Genetics is coined by?

View answer and explanation

Correct option: B

Bateson

Option B (Bateson) is correct because William Bateson coined the term \"Genetics\" to describe the study of heredity and variation.

22 Medium

22 of 365

Application +4 | -1

If the frequency of a recessive phenotype in a stable population is

25\%

, the frequency of the
dominant allele in that population is?

View answer and explanation

Correct option: A

50\,\%

Option A (

50\,\%

) is correct because if the frequency of the recessive phenotype (q²) is 25%, then the frequency of the recessive allele (q) is

\sqrt{0.25} = 0.5

, and the frequency of the dominant allele (p) is

1 - q = 1 - 0.5 = 0.5

or 50%.

23 Medium

23 of 365

Analyzing +4 | -1

Identify the wrong statement.

View answer and explanation

Correct option: D

In domesticated fowls, the sex of the progeny depends on the type of sperm rather than the egg

Option D (In domesticated fowls, the sex of the progeny depends on the type of sperm rather than the egg) is the wrong statement because in birds, sex determination is determined by the type of egg (ZW system), not the sperm.

24 Medium

24 of 365

Understanding +4 | -1

A hereditary disease, which is never passed on from father to son is

View answer and explanation

Correct option: B

X-chromosomal linked disease

The correct answer is C (Y-chromosomal linked disease) because Y-linked genes are only passed from father to son.

25 Medium

25 of 365

Analyzing +4 | -1

Assertion: Genetic make up of sperm determines the sex of human child.

Reason: Males are homogametic in humans

View answer and explanation

Correct option: C

If the assertion is true but the reason is false.

Option C (If the assertion is true but the reason is false) is correct because the genetic makeup of the sperm does determine the sex of the child, but males are heterogametic (XY), not homogametic.

26 Medium

26 of 365

Analyzing +4 | -1

The wife of an albino person is normal, but his son is albino. This indicates that the lady for this trait is

View answer and explanation

Correct option: B

Heterozygous

Option B (Heterozygous) is correct because for the son to be albino, both parents must carry the recessive allele, and since the wife is normal, she must be heterozygous.

27 Medium

27 of 365

Analyzing +4 | -1

Assertion: Alleles can transmit from parents to progeny without variations.

Reason: Alleles of different genes could be linked.

View answer and explanation

Correct option: B

If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion

Option B (If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion) is correct because both statements are true, but linkage doesn't explain why alleles transmit without variations.

28 Easy

28 of 365

Understanding +4 | -1

Sex chromosomes of male are

View answer and explanation

Correct option: B

Heterozygous

Option B (Heterozygous) is correct because males have XY sex chromosomes, which are dissimilar, making them heterozygous.

29 Medium

29 of 365

Understanding +4 | -1

Strength of the linkage between the two genes is

View answer and explanation

Correct option: B

Inversely proportionate to the distance between them

Option B (Inversely proportionate to the distance between them) is correct because genes that are closer together are more likely to be inherited together, indicating stronger linkage.

30 Easy

30 of 365

Remembering +4 | -1

Which one of the following is an example of polygenic
inheritance ?

View answer and explanation

Correct option: C

Skin colour in humans

Option C (Skin colour in humans) is correct because skin color in humans is determined by multiple genes (polygenes) that have an additive effect on the phenotype, resulting in a continuous range of skin tones.

Revision notes and key takeaways

Review PRINCIPLE OF INHERITANCE AND VARIATION in your textbook or class notes, then use this set to check your understanding.

Key Takeaways

✓ This set contains 365 single-correct-answer MCQs on PRINCIPLE OF INHERITANCE AND VARIATION.
✓ Try each question before opening its answer. Read the explanation where one is available.
✓ Sign in to save submitted answers. Revisit incorrect answers alongside your textbook or class notes.

Showing 1-30 of 365 questions

Your Progress

Principle of inheritance and variation practice · Mixed difficulty

Explore Other Chapters in BIOLOGY

Key Takeaways

Continue Your Practice

Your practice