Give differences : Male heterogamety and Female heterogamety
 

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Male heterogamety Female heterogamety
 $(1)$ Male produces two types of gametes.  $(1)$ Female produces two types of gametes
 $(2)$ e.g. Human male produces gametes of $\mathrm{X}$ and $Y$-types.  $(2)$ e.g. Female birds produces gametes of $Z$ and $\mathrm{W}$ types.

 

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Describe the process of sex determination in humans.
 

$(a)$ In humans, males are heterogametic and females are homogametic. Explain. Are there any examples where males are homogametic and females heterogametic ?

$(b)$ Also describe as to who determines the sex of an unborn child ? Mention whether temperature has a role in sex determination.