or non-sex chromosomes, and two sex-determining chromosomes. The sex chromosomes in humans are called X and Y. Females carry two X chromosomes, while males carry one X and one Y chromosome.

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.

The short-beaked echidna (Tachyglossus aculeatus)  is one of Australia’s most iconic animals. Belonging to a unique group of ...

The 23rd pair are the sex chromosomes: In females, the two chromosomes are identical in shape. There are two X chromosomes. Females are referred to as XX. In males, one of the chromosomes is a ...

Created with Sketch. X chromosomes are expressed differently depending on whether you are male or female. Since females have two X chromosomes, one may be expressed, or manifest in the phenotype ...

The stages outlined in the following example show a cell with a diploid chromosome number of four (two sets of two chromosomes) undergoing cell division. The replicated chromosomes are not visible ...

The short-beaked echidna (Tachyglossus aculeatus) is one of Australia's most iconic animals. Belonging to a unique group of ...

In a study that could help scientists better understand and manipulate cell division, RIKEN biologists have engineered ...