mitosis in onion root tip cells. interphase onion root tip mitosis cell grows in size cell...

Mitosis in Onion Root Tip Cells

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Mitosis in Onion Root Tip Cells

Interphase

Onion root tip mitosis

•cell grows in size

•cell replicates DNA in preparation for mitosis

•individual chromosomes not clearly discernable

•nucleolus may be visible as dark spot

•nucleus is apparent

Prophase

Onion root tip mitosis

•chromatin in nucleus begins to condense and becomes visible under light microscope

•spindle fibers (microtubules) attach to centromeres of chromosomes

•nuclear envelope starts to break down

Page 5: Mitosis in Onion Root Tip Cells. Interphase Onion root tip mitosis cell grows in size cell replicates DNA in preparation for mitosis individual chromosomes

ProphaseMetaphase

Metaphase

Onion root tip mitosis

•spindle fibers align chromosomes along center of cell (metaphase plate)

Anaphase

Onion root tip mitosis

•as spindle fibers shorten, paired chromosomes separate and move to opposite sides of cell

Telophase

Onion root tip mitosis

•chromosomes are at opposite sides of cell

•nuclear envelope reforms

•cytokinesis begins, in which a new cell wall will be created along the metaphase plate and two daughter cell will be formed

Page 9: Mitosis in Onion Root Tip Cells. Interphase Onion root tip mitosis cell grows in size cell replicates DNA in preparation for mitosis individual chromosomes

Page 10: Mitosis in Onion Root Tip Cells. Interphase Onion root tip mitosis cell grows in size cell replicates DNA in preparation for mitosis individual chromosomes

View of Onion root tip using 400x magnification

Overview of phases of mitotic cell cyclein

terp

hase

inte

rph

ase

pro

ase

meta

ase

aph

ase

telo

phase

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mitosis in onion root tip cells. interphase onion root tip mitosis cell grows in size cell...

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overview of phases