Mitosis and Meiosis

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Mitosis and Meiosis

Higher Biology

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Mitosis and Meiosis

Mitosis:

-division of somatic (body) cells

Meiosis

-division of gametes (sex cells)

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Mitosis

Interphase

Prophase

Metaphase

Anaphase

Telophase

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Interphase

Interesting things happen!

Cell preparing to divide

Genetic material doubles

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Prophase

Chromosome pair up!

Chromosomes thicken and shorten

-become visible

-2 chromatids joined by a centromere

Centrioles move to the opposite sides of the nucleus

Nucleolus disappears

Nuclear membrane disintegrate

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Metaphase

Chromosomes meet in the middle!

Chromosomes arrange at equator of cell

Become attached to spindle fibres by centromeres

Homologous chromosomes do not associate

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Anaphase

Chromosomes get pulled apart

Spindle fibres contract pulling chromatids to the opposite poles of the cell

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Telophase

Now there are two!

Chromosomes uncoil

Spindle fibres disintegrate

Centrioles replicate

Nucleur membrane forms

Cell divides

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Meiosis

4 daughter cells produced

Each daughter cell has half the chromosomes of the parent

2 sets of cell division involved

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