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Chapter 15: The Eukaryotic Cell Cycle, Mitosis, and Meiosis - Coggle…
Chapter 15: The Eukaryotic Cell Cycle, Mitosis, and Meiosis
general information
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karyotype
reveals number, size and form of chromosome
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mitotic spindle
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animals cells have centrioles, other eukaryotes don't
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Mitosis
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stages
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metaphase
when alignment is complete, cell is in metaphase
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anaphase
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kinetochore microtubules shorten, pulling the chromosomes to respective poles
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the two poles move away from eachother as overlapping polar microtubules lenghten and puch against each other
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Meiosis
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for reproduction, occurs in germ cells
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Stages
meiosis 1
anaphase 1
segreation of homologous, connections between bivalents break. each homologous pair moves to opposite poles
telophase 1
sister chromatids reach their poles and decondense, reformation of nuclear membrane
metaphase 1
bivalents organized along the equator, mechanism to promote genetic diversity
prometaphase 1
spindle apparatus completes, chromatids attach to the spindle via kinetochore microtubule
prophase 1
chromosomes condense, bivalents forms and nuclear membrane disappears
cytokinesis
end of meiosis 1,2 haploid cells with no homologous chromosome pair develops
meiosis 2
metaphase 2
sister chromatids aligh along the equator, each pair attached to both poles
anaphase 2
sister chromatids seperate, individual chromosomes move to respective poles, polar microtubules lenghten and pushes the poles apart
prometaphase 2
nuclear envelope completely dissociates, sister chromatids attach to the spindle via kinetochore microtubules
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prophase 2
sister chromatids condense, spindle apparatus forms and nuclear envelope dissociates into vesicles