Differentiate between 'ZZ' and 'XY' type of sex-determination mechanisms.
The differences between ZZ and XY type of sex-determination mechanisms are listed below:
|ZZ Sex-Determination Mechanism||XY Sex-Determination Mechanism|
|In this type of chromosomal sex determination mechanism, the females are heterogametic, that is, they produce two types of gametes, while the males are homogametic.||In this type of chromosomal sex determination mechanism, the males are heterogametic, that is, they produce two types of gametes, while the females are homogametic.|
|Here, the females produce two types of eggs (A+Z) and (A+W), while the males produce only one type of sperm (A+Z).||
Here, the males have an X chromosome and its counterpart Y chromosome, which is distinctly smaller. Hence, the males are XY. However, females have a pair of X chromosomes; therefore, they are XX.
|Organisms that have the ZZ type of sex-determination mechanism are birds, fishes, some reptiles, etc.||Organisms that have the XY type of sex-determination mechanism are humans and Drosophila.|
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