cell divison

interphase

when cell is not dividing but making new organelles, enzymes and cytoplasm in preparation for cell division

mitosis

the division of one nucleus into two identical nuclei each with the same number of chromosomes and identical genes

function of spindle

contract, pull chromosomes apart and move them to poles of cell

name a group of disorders which cells lose control of rate of mitosis and cell division + two possible causes

cancer + UV rays / X rays

two events that occur during prophase

The nuclear membrane starts to break down

Spindle fibres appear in the cytoplasm.

two events that occur during metaphase

the nuclear membrane is fully broken down

The chromosomes line up across the equator (centre) of the cell.

how does cell division occur in animals

A cleavage furrow forms, deepens and splits the large cell with two nuclei into two identical animal cells.

how does cell division occur in plants

Cell plates form in plant cells. These form two new cell walls; forming two identical plant cells.

haploid(n) v diploid (2n)

haploid- one set of chromosomes eg. gametes

diploid-two sets of chromosomes eg.somatic cells

cell continuity

cells develop from pre-existing cells

meiosis

one cell divides to produce four new cells

meiosis

production of gametes

which phase; growth in multicellular organisms

mitosis

two events that occur during interphase

photosynthesis

respiration

whats the function of mitosis in multicellular organisms

growth and repair

4 stages of mitosis

prophase

metaphase

anaphase

telephase

what stage is this

prophase

what stage is this

metaphase

what stage is this

anaphase

what stage is this

telophase

what is cancer

disorder where rate and number of mitotic divisions are uncontrolled

what type of microscope used

compound light microscope

define mitosis

a form of nuclear division, where one nucleus divides to form two identical daughter nuclei

meiosis V mitosis

meiosis; halves chromosomal number.4 daughter nuclei formed.introduces genetic variation.

mitosis;maintains chromosomal number.2 daughter nuclei formed.genetically identical

why mature human red blood cells do not undergo mitosis

no nucleus