How is gametes formed starting with interphase?
**Interphase** [‘Living’ stage] Obtains nutrients, grows, reads its DNA, other “normal” functions Cell increases in size and number of organelles Replication of DNA 90% of cell cycle Interphase is followed by two cycles of nuclear division. One cycle separates homologous chromosomes, and the other separates the chromatids. These are usually referred to the first and second meiotic divisions and result in the formation of four haploid nuclei from one diploid nucleus. This type of division occurs during gametogenesis, the production of sperm and ova. **Prophase I** Chromosomes condense and become visible as single threads Each chromosome appears to have a beaded appearance due to localised coiling of DNA Homologous chromosomes pair up precisely along their length – a process called synapsis More condensation makes them appear fatter and shorter Each pair of homologous chromosomes is called a bivalent Chiasmata form due to attraction of non-sister chromatids 1 chiasmata bivalents are cros
