Have you ever wondered if there were more species than there used to be today? Were the genetic changes random back then? Many changes may occur in an organism’s DNA over time in order to survive based on changes in their surroundings. This is what makes one generation different from another generation which can result in a whole new species.
Genetic changes were not random back then. Not all changes took place at the same rate either. The X chromosome proved to be more stable than chromosome III and has remained large throughout evolution. The X chromosome is found twice in females and once in males, while the Y chromosome lost most of its genetic material early in its evolution and is found only once in males and not at all in females. The X chromosome has more than 1000 genes, while the Y chromosome has less than 200 genes. How might this happen?
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When two populations no longer interbreed this causes evolution of two separate species. This may be caused by behavioral isolation, geographic isolation, or temporal isolation. If they become so different they will no longer be able to interbreed because each organism will have a different number of chromosomes, so the genetic information from the male can’t find a proper match with the genetic information from the female. When this occurs the population of that organism can decrease.
Why would organisms change their DNA? They change their DNA to adapt more to their environment to survive. This is called Natural Selection. First of all, they need to change their DNA in order to adapt to their environment. Second, they need to adapt to survive. Finally, they adapt to produce more offspring. Changing their DNA to improve their chance of survival is what makes the next generation so different from the previous generation which can even result in a whole new