Males produce two sperms .One X and other Y. 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.
Some times abnormalities may also occur known as NON DISJUNCTION..FOLLOWING FIGURE MAY CLEAR IDEA..
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