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| Sex Determination |
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| During the formation of gametes, the females will have only one type of gametes, all with one X chromosome. However, the males will produce two types of gametes or sperms, half with X chromosome and half with Y chromosome. Thus the sex of a zygote is determined by which male gamete fuses with the female gamete. |
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| Sex Chromosomes |
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| If the X gamete fuses with the female gamete (also X), the zygote will be a female. If the Y gamete fused with the female gamete, the zygote will be a male. This type of sex determination is called XX-XY type. |
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