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Summary OCR A/AS-Level Biology 2.6.3 Stages of Meiosis
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Revision Summary of key knowledge from OCR A/AS-Level Biology 2.6.3 Stages of Meiosis.
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Stages Of MeiosisProphase I Prophase II
Chromosomes supercoil and condense Chromosomes supercoil and condense
into chromatids into chromatids
Chromatids take up stain mor easily and Chromatids take up stain mor easily and
become more distinct become more distinct
Nuclear envelope breaks down Nuclear envelope breaks down
Centrioles divide and migrate to the Centrioles divide and migrate to the
poles poles
Chromosomes form homologous pairs Non-identical
and crossing over occurs
Metaphase II
Metaphase I Spindle fibres attach to centrioles and
Spindle fibres attach to centrioles and centromeres of chromatids
centromeres of homologous pairs Each centromere attaches to both poles
Each centromere attaches to both poles by spindle fibres
by spindle fibres Chromatids line up at the equator
Homologous pairs line up at the equator
Anaphase II
Independent assortment occurs
Centromeres divide
Anaphase I Chromatids are pulled apart towards the
Centromeres divide poles
Homologous pairs are pulled apart
Telophase II
towards the poles
Chromatids reach the poles and start to
Telophase I uncoil into chromosomes
Nuclear envelope starts to reform Chromosomes become less distinct
around each set of chromosomes Nuclear envelope starts to reform
Cell divides by cytokinesis resulting in around each set of chromosomes
haploid cells
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