| Male heterogamety | Female heterogamety |
|---|---|
| $1$. The male individual produces two different types of gametes. | $1$. The female individual produces two different types of gametes. |
| $2$. Example: In humans ($XY$ type),the male produces gametes with $X$ and $Y$ chromosomes. | $2$. Example: In birds ($ZW$ type),the female produces gametes with $Z$ and $W$ chromosomes. |
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