i. The male produces two different types of gametes – Y and X
ii. The female produces only one type of gamete – X
iii. After mating, numerous male gametes surround the female gamete
iv. Some of these male gametes carry Y and other X chromosomes.
v. If the male gamete carrying Y fuses with the female gamete X, the zygote is XY which is a male embryo
vi. If the male gamete carrying X fuses with the female gamete X, the zygote is XX which is a female embryo.
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