Question

X0 sex determination is seen in……..
(a)Man
(b)Drosophila
(c)Birds
(d)Grasshopper
(e)Horse

Answer 1

Hint These ground-dwelling insects with powerful hind legs which allow them to vigorously escape from threats. These insects are plant-eaters, with a few species at times becoming serious pests of cereals, vegetables, and pasture, especially when they swarm in their millions as locusts and destroy crops over wide areas.

Correct answer:
 XO sex determination is seen in grasshopper. In this system of sex determination, only one sex chromosome is involved (X). Male grasshoppers only have one X chromosome (X0) whereas female grasshoppers have two (XX) chromosomes. The lack of a second X is signified by 0. An X chromosome is also contained as maternal gametes, so the sex of the offspring depends on whether the sex chromosome is present in the male gamete.
The sperm of grasshoppers, crickets, and some other insects normally contain either one X chromosome or no sex chromosomes.
Acridology is the study of grasshopper species.
Grasshoppers are plant-eaters and protect themselves from predators by camouflage. Grasshoppers are highly affected by parasites and various diseases and many predatory creatures feed on both nymphs and adults.
Man and Drosophila have an XX-XY sex determination system to determine the sex of the offsprings.
The ZW sex-determination system is found in birds.
A mare has two identical chromosomes X and is XX and a stallion has one X and one Y chromosome so is XY where Y is the male chromosome.

So, the correct answer is 'Grasshopper'.

Note:
-Grasshoppers are plant-eaters and protect themselves from predators by camouflage.
-An X chromosome is also contained as maternal gametes, so the sex of the offspring depends on whether the sex chromosome is present in the male gamete.
-Acridology is the study of grasshopper species.