Cephalopods may have the oldest sex chromosomes of any animal, according to a new discovery in the octopus genome. That's a big deal given that scientists didn't know until now if these oddball ...

The oldest-known sex chromosome emerged in octopus and squid between 455 million and 248 million years ago — 180 million years earlier than the previous record-holder, scientists have discovered. When ...

A genome sequence for the flatworm Schmidtea mediterranea reveals a chromosome that might be primed to become a sex chromosome. The finding offers a remarkable chance to study the evolution of sex ...

Researchers from Tokyo Metropolitan University have taken a big step in solving the mystery around why animals evolve sex chromosomes. It had long been proposed that sex chromosomes evolve to reduce ...

AMES, Iowa – A new study led by an Iowa State University scientist sheds light on how organisms have evolved to address imbalances in sex chromosomes. The study looks at a species of softshell turtle, ...

Tokyo, Japan – Researchers from Tokyo Metropolitan University have taken a big step in solving the mystery around why animals evolve sex chromosomes. It had long been proposed that sex chromosomes ...

One of the fundamental rules of inheritance states that different alleles (gene copies) of a trait, such as sex, are ...

Every human cell has a pair of chromosomes that give your body a blueprint for how to grow and develop starting as a single cell inside a uterus. But in a new study from the Cedars-Sinai cancer center ...

Orange cats have always stood out in the living room, but new research shows they also stand apart in the mammal family tree. Scientists have now traced their vivid coats to a genetic arrangement that ...

Humans carry 46 chromosomes. We get one from each parent, making 22 pairs of autosomal chromosomes, and one pair of sex chromosomes. Women usually carry two X (sex) chromosomes, while men typically ...

Washington, DC – Researchers at Georgetown University Medical Center (GUMC) have determined that something in female sex chromosomes appears to trigger a rise in blood pressure after the onset of ...

Sex chromosomes are derived from " normal " chromosomes -- the autosomes -- after acquiring a new, sex-determining mutation. The resulting new chromosome pair takes separate paths in the course of ...