Males are the homogametic sex ( ZZ ), while females are the heterogametic sex ( ZW ).
2.
Many butterflies are ZW sex-determination system where females are the heterogametic sex ( ZW ) and males homogametic ( ZZ ).
3.
Thus, heterogametic male organisms with one X chromosome may match the level of expression achieved in homogametic females with two active X chromosomes.
4.
The homogametic sex ( females in humans ) receive two of each sex chromosome and therefore need to be homozygous to show a recessive trait.
5.
This could cause the heterogametic sex chromosome in the hybrid to be inviable or sterile, but homogametic sex chromosome will be fertile ( Futuyma 1997 ).
6.
In ZW sex-determination system used by birds the opposite is true : the male is the homogametic sex ( ZZ ), and the female is heterogametic ( ZW ).
7.
In mammals, the female is homogametic, with two X chromosomes ( XX ), while the male is the heterogametic sex, with one X and one Y chromosome ( XY ).
8.
However, in birds, and some reptiles, males have two Z sex chromosomes and so are the homogametic sex, while females, with one Z and one W chromosome, are the heterogametic sex.
9.
Birds and many insects have a similar system of sex determination ( " ZW sex-determination system " ), in which it is the females that are heterogametic ( ZW ), while males are homogametic ( ZZ ).
10.
For example, in humans, males, with an Y sex chromosome, would be referred to as the heterogametic sex, and females having two X sex chromosomes would be referred to as the "'homogametic sex " '.
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