do not share any sex chromosome, the female one is named "U" and the male one "V".

In humans and most mammals, the Y chromosome is visibly smaller in size than the X chromosome, a condition known as heteromorphic sex chromosomes. Likewise in birds, the W chromosome is often visibly smaller than the Z chromosome. In contrast, it is nearly impossible to visually differentiate between the sex chromosomes of amphibians and some reptiles; as a result, these sex chromosome pairs are said to be homomorphic.

Differentiation

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