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4688912
Mitosis
Descrição
A-Level Biology (Cell Division) Mapa Mental sobre Mitosis, criado por Fauzia Ali em 29-02-2016.
Sem etiquetas
biology
cell division
a-level
Mapa Mental por
Fauzia Ali
, atualizado more than 1 year ago
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Criado por
Fauzia Ali
mais de 8 anos atrás
6
1
0
Resumo de Recurso
Mitosis
Chromosomes
DNA wound tightly around proteins called histone
Normally unwound (Chromatin)
Before cell division, replicates and winds to form chromosomes (visible)
Twice the DNA
Made of two structures called CHROMATIDS held by a CENTROMERE
Prophase
Chromosomes visible as they thicken and shorten
Two identical chromatids
Animal cells: centrioles divide and move to opposite poles
Start to form spindle
Nuclear membrane disintegrates
Nucleolus disappears
Metaphase
Chromosomes arrange at the equator
Chromosomes attached to spindle by centromere
Anaphase
Spindle fibres contract
Centromeres split so chromatids pulled apart
Separate chromatids now called CHROMOSOMES
Very fast
Telophase
Chromosomes reach poles
Chromosomes uncoil and lengthen
Spindle breaks down
Nuclear membranes reforms
Nucleoli reappears
Cytokinesis
Centrioles divide and move to poles
Membrane furrows and cytoplasm splits
Daughter cells have all organelles needed
Significance
Growth
Repair damaged tissue
Cell replacement
Asexual repoduction
Bulbs
Large number of offspring for colonisation
Produces
4 genetically identical daughter cells
Diploid
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