Question:
Which one of the following statements is correct ?
Which one of the following statements is correct ?
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ZZ is male in birds; XO is male in grasshoppers; XXY is Klinefelter.
Updated On: Oct 22, 2026
- Homozygous sex chromosomes (ZZ) determine female sex in birds.
- XO type of sex chromosomes determine male sex in grasshoppers.
- XXY condition in humans is found in Turner's syndrome.
- Homozygous sex chromosomes (XX) produce males in Drosophila.
Show Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understand the question:
Each option states a fact about sex determination. We check them one by one against the NCERT facts.
Step 2: Check option (A):
Birds follow the ZW type. The male has two Z chromosomes (ZZ) and the female has Z and W (ZW). So ZZ gives a male, and (A) is wrong.
Step 3: Check option (B):
In grasshoppers (XO type), the male has one X chromosome only (XO), and the female has XX. So the XO type determines the male sex, and (B) is correct.
Step 4: Check options (C) and (D):
(C) XXY is Klinefelter's syndrome, with 47 chromosomes. Turner's syndrome is XO (45 chromosomes). So (C) is wrong.
(D) In Drosophila, XX is female and XY is male. So (D) is wrong.
Final Answer:
Only (B) is correct. \[ \boxed{\text{(B)}} \]
Each option states a fact about sex determination. We check them one by one against the NCERT facts.
Step 2: Check option (A):
Birds follow the ZW type. The male has two Z chromosomes (ZZ) and the female has Z and W (ZW). So ZZ gives a male, and (A) is wrong.
Step 3: Check option (B):
In grasshoppers (XO type), the male has one X chromosome only (XO), and the female has XX. So the XO type determines the male sex, and (B) is correct.
Step 4: Check options (C) and (D):
(C) XXY is Klinefelter's syndrome, with 47 chromosomes. Turner's syndrome is XO (45 chromosomes). So (C) is wrong.
(D) In Drosophila, XX is female and XY is male. So (D) is wrong.
Final Answer:
Only (B) is correct. \[ \boxed{\text{(B)}} \]
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