Zoology - Principles of Inheritance and Variation Question with Solution | TestHub

XO and XY sex determinations are included in male heterogamy. In XO sex determination usually male carries 1 chromosome less as compared to female, like Grasshopper. XY sex determination is found in human and Drosophila. ZW type of sex determination is included in female heterogamy in which female carries ZW sex chromosomes while male carries ZZ sex chromosomes, examples - Birds (Aptenodytes = Panguin). Haploidy-diploidy sex determination is found in Honey bee (Apis).