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APBiology- Essay review 04-17-08

APBiology- Essay review 04-17-08 - cell One organism that...

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Gametes are sex cells. Sex cells are replicated by a process known as meiosis, where an offspring is created by the fusion of haploid gametes to form a zygote, which is diploid. Meiosis takes places in organisms that reproduce sexually. Meiosis takes two phases: one in which the sex cell is replicated into 2 sex cells, and another where the 2 sex cells are replicated into 4 sex cells. In interphase, the DNA replicates itself. In prophase I, sister chromosomes will pair. In metaphase, the chromosomes will align in a line in the center of the gamete. In anaphase I, the spindles will move the chromosomes towards the poles of the cells, and in telaphase I they begin to separate. The two cells then again separate into four cells during prophase II, metaphase II, anaphase II, and telophase II. So, one germ cell’s chromosomes are halved during the two step process of meiosis, and the resulting four gamete cells all have half the number of chromosomes as the original germ
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Unformatted text preview: cell. One organism that reproduces asexually would be certain cnidarians. Certain cnidarians reproduce by budding, which is the process of new individuals splitting off from existing ones. This means that new organisms will grow out of the body of the parent organism. One advantage of asexual reproduction is that asexual reproduction requires less time to occur. When an animal is asexual, it doesn’t have to find a partner of the same organism to help mate. It instead can reproduce w/ itself. One organism that reproduces sexually would be a human. Humans reproduce when the sperm from a male fertilizes the egg of a female. The new organism then grows during a gestation period inside the mother before being born. One advantage to this is the fact that the method of using DNA from two different genetically different humans increases the genetic diversity of the offspring. The offspring will be genetically unique....
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