October 5th 2018 archive

Biology 11 – Darwin and DNA –

The discovery of DNA proved Darwin’s theory of evolution for many reasons. Some of these reasons include, gene similarities in different species, and corrupt DNA. Genetic similarities in different species is very important, and was even mentioned in the NOVA video we watched in class. An example of genetic similarities would be the genetic relationship between human and chimp DNA. There is a 1% difference between human DNA and chimp DNA.


This means, that in some point in time there was a species that is now a common ancestor between humans and chimps. In the video, the species that was this connection is fish. Fish are a common ancestor with dinosaurs and all four legged creatures (for example humans and chimps). One visible similarity between humans and fish, is between human embryo and fish embryos, as was shown in the video. If you compare two images of a human and fish embryo, there are clearly slits (gills) along the neck of both species, for humans these slits (gills) turn into bones in our inner ears, and for fish, these slits turned into gills.


Corrupt DNA is also very important to Darwin’s theory. A big part of Darwin’s theory is that an organism changes into another organism. For this to happen, changes must also happen to a genome over time. Because of this, scientists are able to see relationships between species because of the basic hereditary systems that DNA and RNA use. These systems are used to pass on genes from parents to their offspring. Because of this, it tells how species are closely or distantly related. Telling if species are closely or distantly related, is very similar to what Darwin’s branched out tree of life looks like, like it was shown in the video. This tree shows how all species are related together, whether they are closely related or distantly, all because of their DNA. That is how DNA proved Darwin’s theory of evolution.


Pre-Calc 11 – Week 5 –

This week, I was away from a lesson we did. After asking a few people, none seemed to have any notes. One of the many things that I learned this week, is that you can ask Mrs. Burton for the notes, if you can’t find any. Because of this, I was very confused for this lesson on how to do anything. One of the things I was most confused with though, was solving an equation. To better understand how, the “gift” technique.

For this equation, the seven is in front of the root. This can be thought of as a bow on top of a gift, you need to take it off before you can “open” any of the rest of the equation. To do this, you have to divide both sides by seven to get rid of it. Next, you have to get rid of the root or the “wrappping”. To do this, you have to square both sides. After you have done this, you have one last step to get to the “gift” (to isolate x). You have to get rid of the number that is next to the x. To do this, you divide both sides by two (or the number that is there). And this will give you your gift, or your answer.