Biology (A-Level)/Meiosis


 * This will teach the process of meiosis to A-Level. Specifically, that of the 2008 AQA specification.



Definitions

 * Homologous chromosomes &mdash; chromosomes that contain the same genes.
 * Maternal homologues &mdash; chromosomes from the original female parent.
 * Paternal homologues &mdash; chromosomes from the original male parent.
 * The diagram shows a chromosome.
 * Each of the strands is a chromatid.
 * Chromosomal crossover &mdash; the process by which two chromosomes pair up and exchange sections of their DNA.

Stages of meiosis

 * Prophase I &mdash; Homologous pairs of chromosomes in a diploid cell pair up forming bivalents. Chromosomal crossover occurs.
 * Metaphase I &mdash; Bivalents line across equator of the spindle opposite homolguos pair of chromosomes.
 * Anaphase I &mdash;
 * Telophase I &mdash;
 * Interphase &mdash;
 * Prophase II &mdash;
 * Metaphase II &mdash;
 * Anaphase II &mdash;
 * Telophase II &mdash;