<P> Mitosis was discovered in frog, rabbit, and cat cornea cells in 1873 and described for the first time by the Polish histologist Wacław Mayzel in 1875 . The term is derived from the Greek word μίτος mitos "warp thread". </P> <P> The primary result of mitosis and cytokinesis is the transfer of a parent cell's genome into two daughter cells . The genome is composed of a number of chromosomes--complexes of tightly coiled DNA that contain genetic information vital for proper cell function . Because each resultant daughter cell should be genetically identical to the parent cell, the parent cell must make a copy of each chromosome before mitosis . This occurs during the S phase of interphase . Chromosome duplication results in two identical sister chromatids bound together by cohesin proteins at the centromere . </P> <P> When mitosis begins, the chromosomes condense and become visible . In some eukaryotes, for example animals, the nuclear envelope, which segregates the DNA from the cytoplasm, disintegrates into small vesicles . The nucleolus, which makes ribosomes in the cell, also disappears . Microtubules project from opposite ends of the cell, attach to the centromeres, and align the chromosomes centrally within the cell . The microtubules then contract to pull the sister chromatids of each chromosome apart . Sister chromatids at this point are called daughter chromosomes . As the cell elongates, corresponding daughter chromosomes are pulled toward opposite ends of the cell and condense maximally in late anaphase . A new nuclear envelope forms around the separated daughter chromosomes, which decondense to form interphase nuclei . </P> <P> During mitotic progression, typically after the anaphase onset, the cell may undergo cytokinesis . In animal cells, a cell membrane pinches inward between the two developing nuclei to produce two new cells . In plant cells, a cell plate forms between the two nuclei . Cytokinesis does not always occur; coenocytic (a type of multinucleate condition) cells undergo mitosis without cytokinesis . </P>

Describe what happens in both animal and plant cells in the stages of mitosis