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zz sex - ZW sex-determination system - Wikipedia


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The ZW sex-determination system is a chromosomal system that determines the sex of offspring in birds, some fish and crustaceans such as the giant river prawn, some insects (including butterflies and moths), and some reptiles, including Komodo dragons. The letters Z and W are used to distinguish this system from the XY sex-determination system. XVIDEOS zz videos, free. XVideos.com - the best free porn videos on internet, 100% free.