Chromosome:

found in the nucleus of the cell and made of the [2: nucleic ] acid [1: DNA ] and [2: protein .] called chromatin. It contains the [2: genetic ] code that is transmitted when the sperm and egg combine to form a new organism. Small units on the chromosomes, called [2: genes ], determine the hereditary characteristics, such as eye colour, leaf shape etc. of the organism. [2: Genetics chapter on chromosomes ]; [3: chromosome number of various species ]; [3: what are telomeres? ]; [3: see human chromosmes (left) and chimpanzee chromosomes (right) ( ref )] [3: chromosomes of human, chimpanzee, gorilla, and organgutan ]