4.4a In multicellular organisms, cell division is responsible for growth, maintenance,

and repair. In some one-celled organisms, cell division is a method of asexual


4.4b In one type of cell division, chromosomes are duplicated and then separated into

two identical and complete sets to be passed to each of the two resulting cells. In this

type of cell division, the hereditary information is identical in all the cells that result.

4.4c Another type of cell division accounts for the production of egg and sperm cells in

sexually reproducing organisms. The eggs and sperm resulting from this type of cell

division contain one-half of the hereditary information.

4.4d Cancers are a result of abnormal cell division.