M-Phase Prophase – Metaphase – Anaphase – Telophase Prophase – chromatin begins to tightly...
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Transcript of M-Phase Prophase – Metaphase – Anaphase – Telophase Prophase – chromatin begins to tightly...
M-Phase• Prophase – Metaphase – Anaphase – Telophase
• Prophase – chromatin begins to tightly coil (condenses)– nuclear envelope begins to disappear – nucleoli disappear – each chromosome is now a complex of sister chromatids – mitotic spindle begins to form – centrosomes move away fro each other
• Prometaphase – nuclear envelope fragments – microtubules move through the nuclear area through
the center of the cell – each sister chromatid complex is now connected to a
microtubules by the kinetochore region of the centromere
M-Phase• Metaphase
– longest phase of Mitosis– centrosomes are now at opposite
sides of the cell – chromosomes are located at the
metaphase plate (center) – kinetochores of the sister
chromatids are now attached to tubules of opposite centrosomes
– microtubule complex is now called the spindle
M-Phase• Anaphase
– shortest phase of Mitosis– sister chromatids are pulled apart
as the spindle fibers shorten – the separated chromosomes
migrate toward the opposite poles
– at the end of anaphase the polar regions of the cell have equivalent amounts and types of chromosomes
M-Phase• Telophase
– the 2 daughter cell nuclei begin to form
– nuclear envelopes begin to form from the parent fragments
– chromosomes become less condensed
– mitosis is complete with the completion of the 2 nuclei regions