In gamete production, the males produce spermatozoa, each containing one sex chromosome, which may either be X or Y-chromosome. Thus, they also have two types of gametes: a sperm carrying the X-chromosome and another with the Y-chromosome.
Word origin: Greek héteros (other, different) Compare:
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To clarify some of the terminology: female humans are referred to as homogametic - they have only one type of sex chromosome, the X. Males are heterogametic, having two different types of sex chromosomes, the X and the Y. In birds and some other animals, females are heterogametic, and males are ...
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