Class 12 NEET Biology Principles of Inheritance and Variation Questions Part 2

XO type of sex chromosomes determine male sex in grasshoppers. This type of sexdetermination comes under XX-XO type. Its common examples are cockroaches, grasshoppers and bugs. The female has two homomorphic sex chromosomes XX and is homogametic. It produces similar eggs, each with X-chromosome. The male has one chromosome only and is heterogametic. It produces 2 types of sperms : gynosperms with X and androsperms withoutX. Fertilisation of an egg by X-bearing sperm yields female offspring and by no X sperm yields male offspring.