How does a cell division occur?

Answer 1

There are three kinds of cell division: mitosis, meiosis, and binary fission.

Mitosis occurs when a eukaryotic organism needs to produce more cells, all genetically identical to the existing cell. It is therefore common in growth of multicellular organisms, and in asexual reproduction. The cell dividing by mitosis may be diploid (for example a human zygote) or haploid (for example a male honey bee). The mitosis again divided into four phases. They are- 1. Prophase 2.Metaphase 3.Anaphase 4.Telophase

Meiosis halves the chromosome number, usually from two sets (a diploid cell) to one (haploid). In humans this occurs in the formation of gametes, and so the only haploid cells in the human life cycle are the gametes and the cells that divide to form them (secondary oocytes and secondary spermatocytes). In some algae it is the zygote that divides by meiosis, with the result that the zygote is the only cell in the life cycle that is diploid. Meiosis is also important because all the daughter cells are genetically different.

Binary fission is confined to bacteria. It produces two genetically identical cells.

All kinds of cell division must be preceded by one replication of the parent cell's DNA.

Mitosis and meiosis are arbitrarily divided into stages: prophase, metaphase, anaphase, and telophase. Some scientists like to insert another stage, prometaphase, between prophase and metaphase. During telophase or soon after, the cytoplasm is divided; this is called cytokinesis.

Answer 2

There are about three types of cell division: binary fission Mitosis, and Meiosis, so it depends on which one. Wikipedia has a picture of the steps of each one, here's the link: http://en.wikipedia.org/wiki/File:Three_cell_growth_types.png

Does that help? All credit goes to Wikipedia!!!

Answer 3

Each of us began as a single cell. This cell couldn't move, think, see, or do things like laugh and talk. But the one thing it could do, and do very well, was divide-and divide it did. The lone cell became two, and then four, then eight and so on, in time becoming the amazing person that is you. Think of how far you've come. You can laugh at a joke, stand on your head, read a book, eat an ice cream cone, hear a symphony, and do countless other things.

In this chapter, we will discuss how cells divide, a topic that has fascinated scientists since they first observed it through a microscope more than 100 years ago. Scientists can actually watch cells divide under the microscope, and they have been able to figure out the rules of division by carefully observing the process, much as someone could gradually learn the rules of a game like football or Chess by watching it played repeatedly.

But you don't need your own microscope to see cells dividing. By hooking up cameras to their microscopes, scientists have produced stunning images of the process, some of which we've reproduced here.