= reduction division which makes the resulting daughter cells haploid. It can be used for sexual reproduction.
- In sexual reproduction, the offspring are genetically different from each other and from the parents.
- Each parent produces special reproductive cells called gametes. One of these from each parent fuse together at fertilisation to form a zygote.
- In order for the zygote to be a diploid cell with two sets of chromosomes in the nucleus, the number of chromosomes in each gamete needs to be haploid.
- Meiosis involves two separate divisions: Meiosis I and Meiosis II. Each division has four stages: Prophase, Metaphase, Anaphase and Telophase.
Note: Can be remembered by PMAT.
- In Interphase, before Meiosis I, the DNA replicates. Each chromosome then consists of two identical sister chromatids, joined at the centromere.
1. The chromatin condenses and supercoils so the chromosomes shorten and thicken. They can then be seen with a light microscope.
2. The chromosomes come together in their homologous pairs (matching pairs) to form a bivalent. Each member of the pair has the same gene at…