For each chromosome two identical sister chromatids are attached at their centromeres. Pair of centrioles is formed. Centriole pairs move away from each other and spindle microtubules form. Nuclear envelope disappeers. Chromosomes arranged on metaphase plate in homologous pairs.
Spindle fibers attach on each side chromosome pair.
Chromosomes reach poles of cell and each pole has a chormosome set but each chromosome has two chromatids. Cytokinesis divides cytoplasm. Nuclei form and cytokinesis occurs. There are now four daughter cells, each with the haploid number of chromosomes. 10.1.3 crossing over - process that produces individual chromosomes that combine genes inherited from the two parents.