Human biological sex is determined by the sex chromosomes X and Y. In most cases, females possess two X chromosomes, while males have one X and one Y. However, there is some evidence that the Y ...

In particular, it explains that humans have one fewer chromosome pair in their cells than apes, due to a mutation found in chromosome number 2 that caused two chromosomes to fuse into one.

As shown in Figure 4, regions on the arms of mouse chromosomes 10 (MMU10), 16 (MMU16), and 17 (MMU17) are syntenic with regions on the long q arm of human chromosome 21. Using some genetic tricks ...

But it might also put us at risk for uniquely human brain disorders. The study appears in Nature. The research focused on parts of chromosomes known as human accelerated regions (HARs), which have ...

Human-accelerated regions (HARs) in chromosomes help human neurons grow multiple neurites. When HARs were added to artificial chimpanzee neurons, as seen on the right, they grew extra neurites, ...