The final pair are sex chromosomes, which scientists label X and Y. The Y chromosome is associated with the development of male sex characteristics. As mentioned in the previous section ...

Humans possess two kinds of chromosomes, labeled X and Y. Typically, females have a pair of X chromosomes in every cell, ...

Researchers have identified a sex chromosome in the California two-spot octopus. This chromosome has likely been around for 480 million years, since before octopuses split apart from the nautilus on ...

Discover how researchers identified an octopus' ancient sex chromosomes and why their genetic history is such a mystery.

Traits as diverse as the color of a person's eyes and the scent of a rose are determined by the information contained in DNA. Learn how this information is coded by strings of molecules called ...

karyotyped them by cutting out individual photographs of each chromosome, and labeled the back of the photos to designate which cell each chromosome came from. Next, they put the chromosomes into ...

Live imaging of embryos at different stages. Chromosomes are labeled in magenta. 4-cell sister blastomeres are shown, along with 3D-reconstructed images of 2-to-4-cell and 4-to-8-cell divisions.

This was possible because unlike mature hepatocytes, the labeled cells had only two copies of each chromosome. By following the descendents of the stem cells for up to a year, the scientists ...

The octopus just revealed another one of its secrets: what determines its sex. University of Oregon researchers have ...

Not all that data was clearly labeled as being from male or female octopuses. But they found another example of the half-sized chromosome in another species of octopus. They also found it in squid ...