Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :Assertion : Y chromosome causes maleness.Reason: If the number of X chromosome is more than one, femaleness dominates.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'C'. Can you explain this answer?

Explore Courses NEET Exam NEET Test Series Free Notes EduRev Infinity

Open App

NEET Exam > NEET Questions > Direction: In the following questions a stat...

Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

Assertion : Y chromosome causes maleness.

Reason: If the number of X chromosome is more than one, femaleness dominates.

a)
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
b)
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
c)
Assertion (A) is true but reason (R) is false.
d)
Assertion (A) is false but reason (R) is true.

Correct answer is option 'C'. Can you explain this answer?

Join for Free

Join for Free

Verified Answer

Direction: In the following questions a statement of assertion (A) is...

In mammals, the presence of a Y chromosome is required for the development of a male sex phenotype. In contrast, the Y chromosome plays no significant role in sex determination in Drosophila. A Y chromosome is required for maleness, moreover, the presence of a single Y chromosome is sufficient even in the presence of several X chromosomes (e.g XXXXY).

View all questions of this test

Most Upvoted Answer

Direction: In the following questions a statement of assertion (A) is...

Assertion: Y chromosome causes maleness.
Reason: If the number of X chromosomes is more than one, femaleness dominates.

The correct answer is option 'C', which states that the assertion (A) is true but the reason (R) is false.

Explanation:
The determination of sex in mammals is based on the presence of sex chromosomes. Humans have 23 pairs of chromosomes, out of which one pair determines the sex of an individual. This pair consists of two sex chromosomes - X and Y.

1. Chromosome Composition:
- Males have one X chromosome and one Y chromosome (XY).
- Females have two X chromosomes (XX).

2. Role of Y Chromosome:
- The presence of the Y chromosome determines maleness in mammals.
- The Y chromosome carries the SRY (sex-determining region Y) gene, which initiates the development of testes in the early stages of embryonic development.
- The testes then produce testosterone, a male sex hormone, which leads to the development of male reproductive organs and secondary sexual characteristics.

3. Role of X Chromosome:
- The X chromosome carries genes responsible for the development of female reproductive organs and secondary sexual characteristics.
- In the absence of the Y chromosome, two X chromosomes lead to the development of female reproductive organs and femaleness.

4. Reason Explanation:
The reason given in the question, "If the number of X chromosomes is more than one, femaleness dominates," is incorrect because it implies that the presence of more X chromosomes determines femaleness. However, it is the absence or presence of the Y chromosome that determines the sex of an individual.

5. Conclusion:
In conclusion, the assertion that the Y chromosome causes maleness is true. However, the reason provided is false because it does not correctly explain the assertion. The presence of the Y chromosome is necessary for the development of male reproductive organs and maleness, while the presence of two X chromosomes leads to the development of female reproductive organs and femaleness.

Answered by Ciel Knowledge · View profile

Answer this doubt

Explore Courses for NEET exam

Similar NEET Doubts

Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:Assertion: A piece of DNA inserted into an alien organism generally does not replicate if not inserted into a chromosome.Reason: Chromosomes have specific sequences called ori region where DNA replication is initiated.

View answer

Direction: Read the following text and answer the following questions on the basis of the same :Mutation is sudden, discontinuous variation in genotype of an organism due to a change in its chromosomes and genes. Variation in DNA is a result of mutation. It is of three types : Gene mutation, chromosomal aberrations and gametic mutation. Gametic mutation is a change in chromosome number that brings effect on the phenotype, it is of two type - aneuploidy and euploidy. Mutation can be artificially produced by certain agents called mutagen. There are two major types of mutagens : physical and chemical mutagen.Give one word for the following

View answer

Direction: Read the following text and answer the following questions on the basis of the same :Mutation is sudden, discontinuous variation in genotype of an organism due to a change in its chromosomes and genes. Variation in DNA is a result of mutation. It is of three types : Gene mutation, chromosomal aberrations and gametic mutation. Gametic mutation is a change in chromosome number that brings effect on the phenotype, it is of two type - aneuploidy and euploidy. Mutation can be artificially produced by certain agents called mutagen. There are two major types of mutagens : physical and chemical mutagen.Change in sequence of nucleotide in DNA is known as ...... .

View answer

Direction: Read the following text and answer the following questions on the basis of the same :Mutation is sudden, discontinuous variation in genotype of an organism due to a change in its chromosomes and genes. Variation in DNA is a result of mutation. It is of three types : Gene mutation, chromosomal aberrations and gametic mutation. Gametic mutation is a change in chromosome number that brings effect on the phenotype, it is of two type - aneuploidy and euploidy. Mutation can be artificially produced by certain agents called mutagen. There are two major types of mutagens : physical and chemical mutagen.Which is the main category of mutation ?

View answer

Direction: Read the following text and answer the following questions on the basis of the same :Mutation is sudden, discontinuous variation in genotype of an organism due to a change in its chromosomes and genes. Variation in DNA is a result of mutation. It is of three types : Gene mutation, chromosomal aberrations and gametic mutation. Gametic mutation is a change in chromosome number that brings effect on the phenotype, it is of two type - aneuploidy and euploidy. Mutation can be artificially produced by certain agents called mutagen. There are two major types of mutagens : physical and chemical mutagen.Aneuploidy which occurs due to loss of a complete homologous pair of chromosomes is

View answer

Top Courses for NEETView all

NEET Mock Test Series - Updated 2025 Pattern

Daily Test for NEET Preparation

Topic-wise MCQ Tests for NEET

DPP: Daily Practice Problems for NEET

Biology Class 11

Top Courses for NEET

NEET Mock Test Series - Updated 2025 Pattern

Daily Test for NEET Preparation

Topic-wise MCQ Tests for NEET

DPP: Daily Practice Problems for NEET

Biology Class 11

View all

Question Description
Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :Assertion : Y chromosome causes maleness.Reason: If the number of X chromosome is more than one, femaleness dominates.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'C'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :Assertion : Y chromosome causes maleness.Reason: If the number of X chromosome is more than one, femaleness dominates.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :Assertion : Y chromosome causes maleness.Reason: If the number of X chromosome is more than one, femaleness dominates.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'C'. Can you explain this answer?.

Solutions for Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :Assertion : Y chromosome causes maleness.Reason: If the number of X chromosome is more than one, femaleness dominates.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for NEET. Download more important topics, notes, lectures and mock test series for NEET Exam by signing up for free.

Here you can find the meaning of Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :Assertion : Y chromosome causes maleness.Reason: If the number of X chromosome is more than one, femaleness dominates.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'C'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :Assertion : Y chromosome causes maleness.Reason: If the number of X chromosome is more than one, femaleness dominates.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'C'. Can you explain this answer?, a detailed solution for Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :Assertion : Y chromosome causes maleness.Reason: If the number of X chromosome is more than one, femaleness dominates.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'C'. Can you explain this answer? has been provided alongside types of Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :Assertion : Y chromosome causes maleness.Reason: If the number of X chromosome is more than one, femaleness dominates.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'C'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :Assertion : Y chromosome causes maleness.Reason: If the number of X chromosome is more than one, femaleness dominates.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'C'. Can you explain this answer? tests, examples and also practice NEET tests.