Centromere: Chromosomes are mostly of the same length and thickness, but at one or more places they are constructed. These places are known as primary constrictions or centromere. Usually, one chromosome possesses only one centromere, but some of them may have more than one centromere.
Centriole: It is a cell organelle of animal cells. It takes part in the spindle formation, during nuclear division. Each animal cell normally possesses a pair of centrioles, lying with their axes at right angles to each other.
Charismata: Charismata is the region on homologous chromatids where the exchange of genetic material (crossing over) takes place.
