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That's a big deal given that scientists didn't know until now that these oddball creatures even had a form of sex determination written into their genes.
We humans rely on an XY system, wherein two X chromosomes create the default female body plan, while the presence of a Y chromosome generally triggers the development of male characteristics. It's possible the octopus's corresponding W chromosome may have been lost over time in a manner similar to the ill-fated trajectory ofintrinsic features of sex determination in animals. But biological research tends to be biased towards mammals. As it turns out, some fish and reptiles, like crocodiles, don't have sex chromosomes at all. The sex of their offspring is instead determined by other, external factors through epigenetic regulations.
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