California two-spotted octopus
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The oldest known sex chromosomes were discovered in an octopus species that lives in the Pacific Ocean. These chromosomes evolved up to 380 million years ago and provide the first evidence of genetic sex determination in cephalopods, including cuttlefish, cuttlefish, octopuses, and nautiluses.
“Sex determination in cephalopods has until now been a complete mystery,” says Andrew Kahn of the University of Oregon. Researchers have long believed that the sex of cephalopods is determined by environmental factors such as temperature. But Khan and his…
Source: www.newscientist.com
