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Consider the following statements:
Assertion(A): In humans, female sex is determined by XX-chromosomes.
Reason(R): Male sex is determined by YY-chromosomes.
Assertion(A): In humans, female sex is determined by XX-chromosomes.
Reason(R): Male sex is determined by YY-chromosomes.
- a)Both A and R are true and R is the correct explanation of A.
- b)Both A and R are true, but R is not the correct explanation of A.
- c)A is true, but R is false.
- d)A is false, but R is true.
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Consider the following statements:Assertion(A): In humans, female sex ...
Humans are diploid with 23 pairs of chromosomes. Of this, 22 pairs are somatic and the one pair is sex chromosomes. This particular pair exists as XX in human females and XY in males. The presence of two X chromosomes contributes to the female phenotype while presence of only one Y chromosome is responsible for the human to be male. Females produce only X-type haploid gametes and males produce two types (X and Y) of haploid gametes. Fusion of either X or Y of male gamete with the female gamete determines the sex of the offspring.
Most Upvoted Answer
Consider the following statements:Assertion(A): In humans, female sex ...
Assertion(A): In humans, female sex is determined by XX-chromosomes.
Reason(R): Male sex is determined by YY-chromosomes.
To understand this statement, we need to have a basic understanding of human sex determination. In humans, sex is determined by the presence or absence of specific sex chromosomes.
Sex Chromosomes
Sex chromosomes are a pair of chromosomes that determine an individual's sex. In humans, there are two types of sex chromosomes: X and Y. Females have two X chromosomes (XX), while males have one X and one Y chromosome (XY).
Explanation of Assertion(A)
The statement in Assertion(A) is true. In humans, females have two X chromosomes (XX). This means that every cell in a female's body contains two copies of the X chromosome.
During sexual reproduction, when an egg is fertilized by a sperm, the egg always contributes an X chromosome. Therefore, if the sperm carries an X chromosome, the resulting zygote will have two X chromosomes, making the individual female.
Explanation of Reason(R)
The statement in Reason(R) is incorrect. Male sex is not determined by YY-chromosomes. Rather, it is determined by the presence of a Y chromosome (XY). The Y chromosome carries specific genes that promote the development of male characteristics.
During sexual reproduction, if the sperm carries a Y chromosome, the resulting zygote will have one X and one Y chromosome, making the individual male. If the sperm carries an X chromosome, the resulting zygote will have two X chromosomes and develop into a female.
Conclusion
Both Assertion(A) and Reason(R) are not in agreement. While Assertion(A) is true and correctly states that females have XX-chromosomes, Reason(R) is false as it incorrectly states that male sex is determined by YY-chromosomes. Therefore, the correct option is (C) A is true, but R is false.
Reason(R): Male sex is determined by YY-chromosomes.
To understand this statement, we need to have a basic understanding of human sex determination. In humans, sex is determined by the presence or absence of specific sex chromosomes.
Sex Chromosomes
Sex chromosomes are a pair of chromosomes that determine an individual's sex. In humans, there are two types of sex chromosomes: X and Y. Females have two X chromosomes (XX), while males have one X and one Y chromosome (XY).
Explanation of Assertion(A)
The statement in Assertion(A) is true. In humans, females have two X chromosomes (XX). This means that every cell in a female's body contains two copies of the X chromosome.
During sexual reproduction, when an egg is fertilized by a sperm, the egg always contributes an X chromosome. Therefore, if the sperm carries an X chromosome, the resulting zygote will have two X chromosomes, making the individual female.
Explanation of Reason(R)
The statement in Reason(R) is incorrect. Male sex is not determined by YY-chromosomes. Rather, it is determined by the presence of a Y chromosome (XY). The Y chromosome carries specific genes that promote the development of male characteristics.
During sexual reproduction, if the sperm carries a Y chromosome, the resulting zygote will have one X and one Y chromosome, making the individual male. If the sperm carries an X chromosome, the resulting zygote will have two X chromosomes and develop into a female.
Conclusion
Both Assertion(A) and Reason(R) are not in agreement. While Assertion(A) is true and correctly states that females have XX-chromosomes, Reason(R) is false as it incorrectly states that male sex is determined by YY-chromosomes. Therefore, the correct option is (C) A is true, but R is false.
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Consider the following statements:Assertion(A): In humans, female sex is determined by XX-chromosomes.Reason(R): Male sex is determined by YY-chromosomes.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true, but R is not the correct explanation of A.c)A is true, but R is false.d)A is false, but R is true.Correct answer is option 'C'. Can you explain this answer?
Question Description
Consider the following statements:Assertion(A): In humans, female sex is determined by XX-chromosomes.Reason(R): Male sex is determined by YY-chromosomes.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true, but R is not the correct explanation of A.c)A is true, but R is false.d)A is false, but R is true.Correct answer is option 'C'. Can you explain this answer? for UPSC 2025 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Consider the following statements:Assertion(A): In humans, female sex is determined by XX-chromosomes.Reason(R): Male sex is determined by YY-chromosomes.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true, but R is not the correct explanation of A.c)A is true, but R is false.d)A is false, but R is true.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for UPSC 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following statements:Assertion(A): In humans, female sex is determined by XX-chromosomes.Reason(R): Male sex is determined by YY-chromosomes.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true, but R is not the correct explanation of A.c)A is true, but R is false.d)A is false, but R is true.Correct answer is option 'C'. Can you explain this answer?.
Consider the following statements:Assertion(A): In humans, female sex is determined by XX-chromosomes.Reason(R): Male sex is determined by YY-chromosomes.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true, but R is not the correct explanation of A.c)A is true, but R is false.d)A is false, but R is true.Correct answer is option 'C'. Can you explain this answer? for UPSC 2025 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Consider the following statements:Assertion(A): In humans, female sex is determined by XX-chromosomes.Reason(R): Male sex is determined by YY-chromosomes.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true, but R is not the correct explanation of A.c)A is true, but R is false.d)A is false, but R is true.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for UPSC 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following statements:Assertion(A): In humans, female sex is determined by XX-chromosomes.Reason(R): Male sex is determined by YY-chromosomes.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true, but R is not the correct explanation of A.c)A is true, but R is false.d)A is false, but R is true.Correct answer is option 'C'. Can you explain this answer?.
Solutions for Consider the following statements:Assertion(A): In humans, female sex is determined by XX-chromosomes.Reason(R): Male sex is determined by YY-chromosomes.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true, but R is not the correct explanation of A.c)A is true, but R is false.d)A is false, but 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 UPSC.
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