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Mitosis Cytokinesis



Mitosis is a type of cell division that produces genetically identical cells. During mitosis DNA
replicates in the parent cell, which divides into two new cells, each containing an exact copy of
the DNA in the parent cell. The only source of genetic variation in the cells is…

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spindle fibres disperse

nuclear membranes from around each set of
Telophase
chromatids

nucleoli form

Cytokinesis


In animal cells a ring of actin filaments forms round
the equator of the cell, and then tightens to form a
cleavage furrow, which splits the cell in two.




In plant cells vesicles move to…

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The cytoplasm di

· Therefore each nucleus with its allocation of cytopbecomes a new cell.

s

A· H
chromosome is present.)

· Diploid (2n): two sets of chromosomes are present in the nuclei (i.e. two of each
different chromosome are present.)

le f Mitosis Formation of a multicellula

· Asexual…

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Stages of Mitosis (Interphase) Metaphase, Anaphase, Telophase. (Interphase)
(Mnemonic ­ I Pee MAT)
Prophase

· chromatin condenses forming chromosomes

· chromosomes shorten, thicken, coil, dehydrate

· each chromosome consists of two identical sister chromatids

o connected at the centromere

· centriole divides ­ forming the spindle fibres

· nuclear envelope…

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Definitions
Chromatin: DNA in its `normal', i.e. functional state -- condenses to form chromosomes.
Chromosomes:

· condensed chromatin showing up as a group of short threadlike structures

· only visible with the light microscope in nuclei during mitosis and meiosis

· each chromosome carries a specific set of genes in…

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I. Prophase
1. The chromatin condenses into chromosomes by dehydrating and coiling. The
chromosomes consist of two identical sister chromatids, joined together by a centromere.
For the first time, they can be seen with alight microscope.
2. The nucleolus and nuclear envelope disappear, and the centriole (animal cells only) divides…

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Chromosomes can be grouped into homologous pairs
Mitosis occurs in
o Growth
o Repair
o Replacement of cells with limiting life span (red blood, skin cells)
o Asexual replacement
Controlled process, cancers result from uncontrolled mitosis of abnormal cells
Division of the nucleus (karyokinesis) and the cytoplasm (cytokinesis) are two…

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