Write short notes XX female and XY male types

XX female and XY male types

This type is present in certain insects like Drosophila and mammals including human. In this type of the female is homogametic XX and male is  heterogametic XY consisting of two dissimilar chromosomes X and Y. The female produces ova all of one type having X chromosome. Male produce two types of sperm X and Y. Thus, in this type of sex determination the presence of Y chromosomes determines the maleness.