Cell division:MEIOSIS
MEIOSIS: The cells undergoes division and results in the formation of haploid daughter cells and reduces the number of chromosomal number by half. Meiosis is also called as Reduction division or Heterotypic division. Key features of meiosis: It involves nuclear and cell division called meiosis-1 and meiosis-2 respectively. Only one cycle of DNA replication takes place. It involves paoring of homologous chromosomes and recombination between them. At last four haploid cells are formed . Meiosis-1: Meiosis-1 initiates when the parental chromosomes replicate to produce identical sister chromatids. It has four phases. They are: 1.prophase-1 2.metaphase-1 3.anaphase-1 4.telophase-1 Prophase-1: It is sub divided into five(5) phases. 1. Leptotene : chromosomes comes closer together and visible under microscope. 2. Zygotene: chromosomes start pairing together forming a synapse. Paired chromosomes are called homologous chromosomes. This c