username2703565
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#1
Report Thread starter 1 year ago
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Hi,
If you was to get a long answer question on meiosis for 6 marks, what exactly would you write?
I was thinking:
- 2 divisions, first one homologous chromosomes separate then sister chromotids
Crossing over - prophase 1
Independant segregation
what else?
thanks
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YellowYellow2
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Prophase 1- chromosomes condense and homologous chromosomes join to form bivalents and crossing over happens. Centrioles migrate to each pole of the cell
Metaphase 1- the spindle fibres elongate and bind to each separate centromere and the homologous chromosomes line up down the equator of the cell. independant segregation of chromosomes happens here
Anaphase 1- spindle fibres contract and each homologous pair is pulled to opposite poles of the cell
Telophase 1- cytokinesis to form two separate cells
Prophase 2- centrioles migrate again
Metaphase 2- the homologous chromosomes line up down the equator of the cell and spindle fibres elongate to bind to each end of the centromere
Anaphase 1- sister chromatids split from the centromere and are pulled to opposite poles of the cell
Telophase- nuclear membrane reforms and the cytokinesis causes the cell to split into 4 daughter cells which are all genetically different
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username2703565
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#3
Report Thread starter 1 year ago
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thank you We never actually did it in that much detail at college!
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