Archivo de la etiqueta: Descent with Modification



In the last classes of Biology, we have been studying Evolution and Natural and Human selection. We were asked to make a 5-line (approx.) summary of it.

Evolution is any change in the heritable traits within a population across generations. Traits are the little things that are specified in our DNA. For example, the color of the eyes, length of the fingers, amount of hair in the body, etc.

Descent with modification is the fact that when parents have children, those children will look and behave a little bit different from them. These changes happen because of random variation in the DNA of he offspring.

Natural selection is something that the nature does to make organisms take advantage of evolution. For example, if ‘nature’ doesn’t want frogs to be eaten by snakes, then a frog would be born with a frightening color. That way, when it reproduces, frogs with that color will not be eaten and the rest will die. This way frogs can keep existing.

When cells reproduce they divide themselves in two, and the two new cells grow back to the normal size. When they duplicate their nuclei is also duplicated, so the DNA is the same in both. But sometimes this might fail and the DNA may have changed. This is called DNA Mutation. This is another form of evolution.

When we reproduce the genes contatined in the DNA and traits of the mother and the father will mix, creating a new set of DNA.  This will be passed on the his/her children and DNA will keep changing. This is Evolution.