Biology (A-Level)/Meiosis
< Biology (A-Level)- This will teach the process of meiosis to A-Level. Specifically, that of the 2008 AQA specification.
Definitions
- Homologous chromosomes — chromosomes that contain the same genes.
- Maternal homologues — chromosomes from the original female parent.
- Paternal homologues — chromosomes from the original male parent.
- The diagram shows a chromosome.
- Each of the strands is a chromatid.
- Chromosomal crossover — the process by which two chromosomes pair up and exchange sections of their DNA.
Stages of meiosis
- Prophase I — Homologous pairs of chromosomes in a diploid cell pair up forming bivalents. Chromosomal crossover occurs.
- Metaphase I — Bivalents line across equator of the spindle opposite homolguos pair of chromosomes.
- Anaphase I —
- Telophase I —
- Interphase —
- Prophase II —
- Metaphase II —
- Anaphase II —
- Telophase II —
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