AP BIOLOGY

Detailed explanation-1: -Nerve cells do not undergo cell division due to absence of centrioles which help in assembling of microtubules during the process of cell division. Nerve cells in fact develop from glial cells by the process of neurogenesis.

Detailed explanation-2: -While these connective tissue cells and epithelial cells can undergo mitosis and regenerate themselves upon damage or to replace the older ones, the main brain cells or the neurons cannot undergo mitosis. Their number remains the same from birth.

Detailed explanation-3: -You read earlier that some cells in humans do not undergo mitosis. Two particular cells that reproduce through another method are sperm cells and egg cells, also called gametes. Instead of mitosis, gametes reproduce through a process called meiosis.

Detailed explanation-4: -Mitosis is a type of cell division that results in two daughter cells having the same number and kind of chromosome as the parent nucleus. It is a part of the cell cycle when the replicated chromosome are separated into two nuclei. The cells which do not divide by mitosis are differentiated cells and sex cells.