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METAPHASE: Pairs of homologous
PROPHASE: Nucleolus disappears, chromosomes (INDEPENDENT
INTERPHASE: nuclear envelope disintegrates, spindle SEGREGATION OF HOMOLOGOUS
Chromosomes duplicate and are fibres start to form from centrioles and PAIRS) line up down the centre of the
invisible CROSSING OVER OCCURS cell. Spindle fibres attach to ne
chromosome of each pair…read more

Slide 3

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1. Each chromosome lines up alongside its homologous pair
2. Chromatids of each pair become twisted around each other at chiasmata
3. Tensions created during this twisting process- causes portions of chromatids to break off
4. Broken portions then re-join with chromatids of its homologous partner. Usually equivalent portions are
exchanged…read more

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Homologous pairs line up randomly down the centre of the cell
On of each pair will pass into each daughter cell and with which one of any of the other pairs DEPENDENT on
how the pairs lined up in the parent cell
These haploid gametes must then fuse to restore diploid state; random fusion= variation…read more

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TELOPHASE: Spindle fibres
disappear, chromosomes reach poles CYTOKINESIS: Cell Splits
Spindle fibres contract chromosomes and nuclear envelope reforms around
are pulled towards the poles each chromosome set…read more

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PROPHASE: Nucleolus Chromosomes line up TELOPHASE: Nuclear
ANAPHASE: Spindle fibres CYTOKINESIS: Cell splits
disappears, nuclear down centre of the cell envelope forms around
contract and pull the sister to form 4 haploid cells
envelope disintegrates, and spindle fibres attach each set of chromosomes
chromatids towards the which are genetically
spindle fibres start to form to sister chromatids at the and nucleolus reforms and
poles of the cell different.
from centrioles centromere of the nucleus splits.
chromosomes…read more


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