Flemming divided mitosis into two broad parts: a progressive phase, during which the chromosomes condensed and aligned at the center of the spindle, and a regressive phase, during which the sister ...

Alongside hormones, the sex chromosomes — X and Y — are one of the starkest ... Among the 22 reawakened genes, one called ...

It is a genetic condition caused when an unusual cell division result in an extra full or even partial copy of chromosome 21.

The most important part of the Y chromosome is the master sex gene called SRY, which triggers a fetus' development as a biological male. "The X and Y were once upon a time just an ordinary pair of ...

Females carry two X chromosomes. One of them is ensconced in a corner in the cell called the Barr body, where it can't express many genes, and scientists thought it didn't do much of anything.

"This is a big part of their biology," said senior author ... For one, inserting at the end of the chromosome helps the transposon avoid genes for the cell's core functioning, which reside in ...