Use chromosome models to demonstrate the role of segregation and independent assortment in the process of meiosis. Discuss how crossing-over can introduce additional genetic variability into the products of meiosis. Meiosis is important for sexual reproduction because it cuts the chromosome number in half, so it can be later restored by sexual reproduction. This prevents the chromosome number from doubling with every generation. Also, meiosis helps create diversity among a population.
Mitosis Occurs in growth and asexual reproduction.
Consists of replication and division of the nucleus, which is usually accompanied by cytokinesis. Interphase occurs between mitotic cycles, and lasts from the end of one cell division to the beginning of the next. Interphase may be called the resting stage, but a cell is never at rest. During interphase the cell grows in size, and more nucleic acids, proteins, and cellular organelles are produced. Chromosomes gradually shorten and thicken, and become visible as double stranded chromosomes.