Question

Which chromosome set is found in male grasshopper?
 (A) XY
 (B) XO
 (C) YY
 (D) XX

Answer 1

Hint: Determination of sex is carried out using various methods, especially during the early stages of an individual.

Complete step-by-step answer:
Some organism like turtles depends on temperatures for sex determination while the sex of humans and insects are determined genetically.
The XO type of sex determination is largely observed in insects like Grasshopper, cockroaches, etc. The chromosome number is different in both female and male parents.
In this type, the male individual produces two different kinds of gametes. Thus, the sex determination of progeny completely relies on the male individual.
The females (egg) produce two sex chromosomes XX, while the males (sperm) produce only one sex chromosome X. There is only one X chromosome therefore they are denoted as XO.
The fertilization of egg by A+X (Autosomal + sex chromosome) type of sperm produces female offspring while the eggs fertilized by A+O (autosomal +no sex chromosome) sperm produces offspring that are male. This type of sex determination occurs in grasshoppers.

	Male	Female
Parents	AA+XO	AA+XX
Gametes	A+X A+O	A+X A+X
Offspring	AA+XX	AA+XO
	Female	Male

Thus, we can say that the determination of the sex of an organism is done by sperm.

The correct option is (B) XO type:

Note: The sex ratio produced in the offspring of grasshopper is 1:1. This type of sex determination is designed as XX-XO type found typically in Grasshopper/Cockroach.