Purposes of mitosis: How execute cells duplicate themselves, and also why? In all complicated multicellular organisms (eukaryotes), cell duplication occurs by a procedure referred to as "mitosis" or cell department. Cells divide for two reasons:Growth. We all began out as a single cell; the fusion of a sperm from dad and also an egg from mom. That original cell separated repeatedly till you prospered and also differentiated right into an organism created of billions of cells. But this raises an amazing problem. When one cell divides into 2, both should have a copy of the genetic information. Thus, prior to cell division occurs, the genes must additionally make duplicates of themselves so that every one of the essential hereditary information ends up in each of the new cells. The first cell divides right into two, and also each of those 2 divide aget, and this process proceeds geometrically along the adhering to progression: 1, 2, 4, 8, 16, 32, 64, 128, and also so on right into the billions. That"s development. Repair. Cells are constantly wearing out and also obtaining damaged, and unless an organism relocations them at least as fast as they are shed, a steady destruction will certainly take place. (If you"re perceptive, you"ll allude out that we"re not simply a huge blob of billions of the same cells. Good point. Although each cell has the complete blueprint (the genome) for just how to develop the body, only particular parts of it gain review and also acted upon, depending upon the eventual function of that cell. Cells differentiate and come to be specialized for a details purpose, but that"s a story for one more day.) In the figure below, blue represents hereditary contributions from dad and also pink represents genetic contributions from mommy. In this easy example, a diploid body cell contains 2n = 2 chromosomes. One chromosome came from mother and also one from dad. In human beings, 2n = 46, so 23 came from mom, and 23 from dad.
Interphase: Each chromosome undergoes replication, making an identical copy of itself. At this point, the chromosomes are still long and thin, and also are not visible inside the nucleus. Cells spend most of their life in this non-dividing phase. See the graphic listed below.
Prophase: The chromosomes coil and shorten, and come to be visible. It becomes obvious that the chromosomes have actually copied. Pairs of the same chromosomes reprimary attached to each various other at the centromere and also each chromosome is referred to as a chromatid.
You are watching: What are two reasons why cells divide
Metaphase: Chromosomes line up along the facility of the cell. A pair of frameworks referred to as centrioles form at the poles of the cell, and also create spindle fibers which affix to the centromeres of each chromosome pair.
Anaphase: The paired chromosomes separation at the centromere and the two halves move alengthy the spindle fibers to oppowebsite sides of the cell. At the same time, the facility of the cell starts to pinch.
See more: Timmy Thomas Why Can T We Live Together Lyrics, Timmy Thomas
Telophase: Cell department occurs, and each is the same to the original. Cells return to Interphase and also prepare for one more round of division.