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By then it was presumed that such a pattern was produced by WW chromosomes. Categories : Sex-determination systems Insect genetics Lepidopterology. The bird Z-like pair shows up on opposite ends of the chain. From Wikipedia, the free encyclopedia. Hermaphrodite Intersex Disorders of sex development Sex reversal. The letters Z and W are used to distinguish this system from the XY sex-determination system. In this system, female has a pair of dissimilar ZW chromosomes and male has two similar ZZ chromosomes.

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