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Biology - Meiosis
Transcript of Biology - Meiosis
Each germ-line cell originally is diploid (2n), but will undergo meiosis to become haploid (n), so that each only has 1 chromosome.
This allows for different genes and chromosomes from each parent.
(Enables genetic diversity) Telophase 1 - The spindle fibres disintegrate and cell division (cytokinesis) begins.
- There are now 2 cells, each with half the number of chromosomes in the original cell. Metaphase 1 - Homologous chromosomes line up on the equator (centre) of the cell in a random arrangement.
- This results each gamete having different parental chromosomes. This is called independent assortment.
- Then the spindle fibres attach to each centromere (where the chromatids are
connected. Prophase 2 - Spindle fibres begin to form at the poles of the cell as in Prophase 1
- The nuclear envelope once again disintegrates. Anaphase 1 - The chromosomes move away from each other along the spindle fibres (pulled away by it)
- Each homologous chromosome is moved to different ends of the cell, so they become haploid. Metaphase 2 - The chromosome line up along the equator, albeit this time there are only 2 chromosomes in each cell. Anaphase 2 - The sister chromatids are moved along the spindle fibres and are separated.
- There are now 4 cells, each with a chromosome with bits of DNA from different chromosomes. Telophase 2 Cytokinesis occurs again and 4 cells are formed, each with a single chromosome with varied genetic information. Prophase I 1. Chromosomes become visible, and each chromosome has a sister chromatid joined at their centromeres (centres).
2. Spindle fibres (cords/strings) begin to form and the nuclear envelope around the chromosomes disintegrates.
3. Two homologous (similar) chromosomes overlap, and they exchange bits of DNA. This is called crossing over. The two chromosomes are no longer the same. Meiosis I Interphase Interphase: Before meiosis begins, DNA replicates itself, creating 2 chromosomes in the cell.
There are two parts to Meiosis division, Meiosis 1 and 2, in which during Meiosis 1 the number of chromosomes are halved, while the sister chromatids (half of the replicated chromosome) are split during Meiosis 2. Meiosis 2 Bibliography Meiosis Diagram. Digital image. Owensboro Community & Technical College. OCTC, n.d. Web. 29 Jan. 2013.
"Animation: How Meiosis Works." Animation: How Meiosis Works. N.p., n.d. Web. 28 Jan. 2013. Vince, Ryan, Eugene Congratulations!
You found the easter egg