INTERPHASE: Centrioles, nuclear envelopment, and chromosomes. PROPHASE: the chromosomes start getting condensed. The nuclear membrane begins to break up, which is the only time the DNA comes out of the nucleus. Centrioles and spindle fibers will pull the chromosomes. By the end, the spindle fibers go to the center and attach to the chromosomes.46 duplicated chromosomes. METHAPHASE: the chromosomes are aligned in the middle. ANAPHASE: the centrioles and spindle fibers start pulling the chromosomes. The centromere breaks, and the sister chromatids become single chromosomes. TELOPHASE: the it’s the end phase. The chromosomes start to link again; nuclear envelope begins to form again. Spindle fibers get disabled; the centrioles are inactive again. CYTOKINESIS: the cleavage furrow is formed, and the cells start to be pulled apart. The cytoplasm is equally distributed, and the organelles are divided as well. Plant cells go through the same process but can’t pull apart because of the wall, so a new membrane is formed. They don’t have centrioles. MEIOSIS: occurs in living things that sexually reproduce. Sexual reproduction occurs in plants too. There are female and male flowers. Biologically, life begins with fertilization. When the zygote is formed, mitosis starts. Mitosis begins at fertilization and stops when you die. Meiosis begins in puberty when an organism becomes sexually mature. Meiosis produces the sperm and the egg when the organism is going through sexual maturation. It has the same process as mitosis, but the set repeats. Meiosis takes the 46 chromosomes, and in the end, we only have 23 because it divides the chromosomes. There is Meiosis I and Meiosis II. In meiosis I, the goal is separated into pairs. In meiosis II, the copies get separated. In meiosis, you end with four daughter cells instead of 2.