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how cells are formed

They are formed from pre- existing cells

why do cells divide

to get the organism to grow, repair and reproduce

Cells

The basic unit of life and the essential link between generations

cells contain

coded information called DNA

DNA

collectively called the organisms genome

Genomes

organized into informational units call genes

Genes

control the activities of the cell

Found in Genes

DNA

housed on chromosomes

genes

composed on chromatid

chromosomes

how many chromosomes do humans have

46

Carries genetic information

chromosomes

Each chromosome may contain

1000s of genes

once cells reach a certain size

they must either stop growing or divide

cell cycle aka generation time

time it takes for one cell to divide

cytokinesis

division of the cytoplasm

interphase

resting phase cells spend most of its life in it

one cell cycle =

mitosis and cyto kinesis

mitosis

involves the nucleus, insures the the nucleus receives the same number of chromosomes present in the original nucleus: actual dividing time

interphase

chromosomes duplicate not considered and actual phase longest phase in mitosis

prophase

chromosomes become visible sister chromatid form nuclear membrane breaks up spindle form

sister chromatids

duplicate chromosomes or identical pairs

centromere

area of attachment that holds sister chromatids together

poles

areas of electromagnetism ( a pull happens)

miotic spindles

fibers that form from the poles aid seperation of sister chromatids

metaphase

all chromosomes ar aligned in the middle sister chromatid go toward opposite poles. spindle fibres attach to chromosomes

anaphase

sister chromatids seperate and move toward opposite poles becomes independent chromosome, chromatids seperate at the centromere

telophase

chromosomes arrive at the poles nucleuar envelope forms to produce two daughter cells

cytokinesis

forms two daughter cells each has the same number and kind of chromosomes as the parent cell. begins in telelphase

asexual reproduction

occurs my mitosis so every organism is the same.

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