Question

Which one of the following conditions correctly describes the manner of determining the sex?

• A. XO type of sex chromosomes determine male sex in grasshopper
• B. Homozygous sex chromosomes (ZZ) determine female sex in birds
• C. Homozygous sex chromosomes (XX) produce male in Drosophila
• D. XO condition in humans as found in Turner’s syndrome determines female sex

Answer 1

The correct option is A

XO type of sex chromosomes determine male sex in grasshopper

The correct option is A.

Explanation for Correct option:

1. The XX-XO type of sex determination is used in grasshoppers.
2. With only one X chromosome, XO, the male is heterogametic.

Explanation for Incorrect option:

Option B:

Females have heteromorphic (ZW) sex chromosomes, whereas males have homomorphic (ZZ) sex chromosomes, resulting in ZW-ZZ sex determination in birds.

Option C:

In Drosophila, homozygous sex chromosome XX results in females.

Option D:

In females, one X chromosome is partially or fully missing from the sex chromosomal pair. this can't be considered for the sex determination process.

Final answer: XO type of sex chromosomes determine male sex in grasshopper correctly describes the manner of determining the sex.