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The XY system contrasts in several ways with the ZW sex-determination system found in birdssome insects, many reptilesand various other animals, in which Best place for single guys in Denver heterogametic sex is female.
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From Club Rancho Cordova bdsm, the free encyclopedia. Snake Sex Determination Dogma Overturned. SRY is a sex-determining gene on the Y chromosome in the therians placental mammals and marsupials.
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