How Cells Multiply

Asexual reproduction is a form of reproduction without sex in which offspring are made by one organism and they inherit their personalities only from their parent. Pretty much the parent makes an identical copy of its self, The main process they use is mitosis. The pros of asexual reproduction are that it is fast, only one parent is needed, all the good characteristics are passed on, they can store large amounts of food and rapid growth the cons of asexual reproduction are, adaption to environment is unlikely, they inherit the bad characteristics of parent, and lack of dispersal. Sexual reproduction is a form of reproduction in which the sperm from a male fertilizes the females eggs. This involves combining genetic information from two individuals. The pros of sexual reproduction are, a new organism is formed, fertilization takes place which mixes their genetic material together, there is a large chance of a unique organism being formed, and the new organism formed with the mixed gametes of the parents has the chance of not getting their parents diseases passed on. The cons are, that it takes longer, only 50% of the population can gestate, 2 parents must be involved, having to find a mate and reproduce, and fertilization has to take place and there are no grantees that the males sex cell will fuse with the females sex cell .

Mitosis is a 5 step process of a type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus (making an identical copy of itself). The first step of mitosis is interphase in this step the DNA replicates itself in preparation for mitosis, the second step of mitosis is prophase This is when the chromatin condenses into two rod-shaped structures called chromosomes, the third step is metaphase in metaphase the cell’s chromosomes align themselves in the middle of the cell, the fourth is anaphase in this the replicated chromosomes are split and the daughter chromatids are moved to opposite poles of the cell, and the last step of mitosis is telophase and cytokinesis in this step the sister chromatids reach opposite poles. The small nuclear vesicles in the cell begin to re-form around the group of chromosomes at each end and then the spindle fibres begin to disappear, two nuclei are formed and the cells divide. Mitosis is a 10 step process where a single cell divides twice to produce four cells containing half the original amount of genetic information. These four daughter cells only have half the number of chromosomes of the parent cell. The first step in meiosis is interphase, the second is prophase l, the third stage is metaphase l, the fourth stage is anaphase l, the fifth stage in meiosis is telophase l, the sixth stage is prophase ll, the seventh stage is metaphase ll, next is anaphase ll, then telophase ll, and lastly cytokinesis. The difference between mitosis and meiosis is that in the process of mitosis it only results in 2 organisms when in meiosis it results in 4 organisms. Another difference between Meiosis and mitosis is that meiosis is a lot longer than mitosis. Another thing is meiosis involves crossing over and in mitosis it doesn’t involve crossing over, and the daughter cells in meiosis are not identical compared to mitosis where they are identical to the parent cell. Also the number of chromosomes in daughter cells produced by meiosis is half the number of chromosomes produced by mitosis.

An organism grows because cell division increases the number of cells in it, it is a process that takes place constantly. As the organism develops and its cells divide, most of them continue to divide. Even when they grow and develop it may look like it has stopped growing but it hasn’t, cell division is still occurring because they are losing cells also.

The longer it lives the bigger it will get because it just keeps increasing the number of cells using cell division. Then the new cells divide to create even more and it is just an endless chain of cell division, this is from mitosis. For example if someone’s bones are growing the cells divide to form the bone structure. When cells need to divide they talk with each other using cyclin signals.

Advantages And Disadvantages Of Sexual Reproduction