Indicate the correct designation of the paired sex chromosomes.

The chromosomes, which predict the sex of individual organisms are known as sex chromosomes. For example, in humans, there are twenty-three pairs of chromosomes, and one of these pairs is considered as the sex chromosomes.  

An egg always constitutes a single X, while sperms carry either X or a Y. Thus, a female possesses two X chromosomes, while a male has one X and one Y. This is the process of predicting sex in humans. Hence, the correct designation of the paired sex chromosomes is XX in females and XY in males.

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