Wednesday, May 13, 2015

Natural selection videos

Video 1

The first video is about how baby barnacle geese have to jump off the cliff face to get food at bottom. First the father jumps down so that the babies follow. But they don't follow. After the mother jumps they jump. The babies need hollow bones so that they don't break them when they hit the rocks. Their softness also helps because they don't hit the wall hard. Only the ones with better bones and more softness survive. The others don't survive because the are not so strong. They had to leave 2 because they wanted to get away from predators.

Video 2

The second video is about how a three month old arctic has to survive alone through 6 months of harsh winter. To survive they have to have soft paws to walk for a long time and to dig for food in the snow. Also they had to have strong legs to jump into lemming holes for food. If they didn't have these traits they couldn't survive. This natural selection makes sure that only the strongest foxes survive the winter.


Monday, May 11, 2015

Evolution Project


Past

The Rhinoceros comes from a group of mammals called perissodactyls. The horses and zebras also come from that group. The Rhino is believed to come directly from a huge dinosaur called the Paraceratherium. It evolved into two different branches: the one horned animals and the two horned animals. The Paraceratherium then shrunk and evolved a horn or two horns.

The present

The Rhino evolved a horn to defend itself from other predators and to impress females. Also, it evolved a large upper lip to grab leaves off trees and to eat break branches. It evolved short legs to run faster through the long savannahs.


The future

In the future the rhino will live in the forest because the savannahs will burn up so the rhinos will adapt to the forest. It will evolve longer legs to move easier through rock and mud. The legs will also help it reach higher trees for food. It will evolve a larger horn to scare off bigger predators like bears and pumas.

References

Monday, April 20, 2015

Evolution Terms


Overproduction is when a species has too many offspring so there wouldn't be enough resources for other species. The iguanas take most of the resources in Galapagos. The live in the water and in the land. So they get resources from both the sea and the land.

Variation is when there are many different types of the same species. In Galapagos there many types of lizards. Some live in water and others live in the land. They have different traits designed for different environments.

Adaptation is when a specie has to adapt to a different environment that it is used to. The Cormorant had to adapt to living in Galapagos because it was not used to diving underwater but then it adapted by developing the ability to swim underwater and losing the ability to fly.

Selection is when a specie survives in a environment because it is best suited for survival in that environment. For example, the lizards wouldn't be able to survive in big cities like Miami because they wouldn't find there food there compared to other smaller iguanas that live in Miami.

Speciation is when a new specie is formed because a population of a specie evolved differently than a population of the same specie so they couldn't reproduce with the other population. Different species of finches evolved on Galapagos to adapt to the kind of food it eats. That happened because they had to adapt to different types environment.

Isolation is when a specie is completely apart from other species. An example of isolation is the Galapagos islands because all the species there were completely ignored and isolated from the rest of the world. That is why the species in Galapagos were able to evolve.





Sunday, April 19, 2015

Natural selection

In wildlife there are many different types of natural selection. For example artic foxes' coats turn brown in the summer and white in the winter. If the coat would remain brown then predators would find it easier to see the foxes. A lot of species need natural selection to survive. Every animal has a variety of traits that are necessary for their survival. If you put a polar bear in the forest with a brown bear, the hunters would find it easier to hunt the polar bear because of their coats. Then the brown Bears will have offspring and the polar bears would try to evolve to adapt into the forest.

Friday, March 13, 2015

Stem cells essay


     

         Stem cells are cells that are unspecialized because they aren't assigned to any body part, they divide and change into different types of cells. There are two types of stem cells: embryonic stem cells and adult stem cells. The embryonic stem cells are gotten from the embryo before it turns into a baby. The adult stem cells are gotten from donors bone marrow and blood. Embryonic stem cells can divide into all kinds of cells. Adult stem cells can't divide into all of the cells. Embryonic stem cell research causes controversy.

        People say embryonic stem cell research is bad because scientists destroy the embryo and get the cells that are inside. People say that scientists are killing life when they do that because life is formed when the sperm fertilizes the egg. People say that we can research adult stem cells which doesn't kill life. They say that instead of killing life scientists should focus on gathering adult stem cells.

        Other people argue that scientists are not killing life because "this cluster of cells" is not the same of a human person. They argue that life is formed after with the first heartbeat. They say that if they continue researching embryonic stem cells we can cure paralyzed people. Also, they argue that adult stem cells are harder to get than embryonic stem cells and they don't as well as embryonic stem cells. If they use induced pluripotent stem cells it will take longer to find cures for diseases.

        It all comes down to where life begins. I say embryonic stem cell research should be done because scientists are not killing babies, they are using cells that were going to be destroyed anyway. Also, if we continue to study embryonic stem cells we could cure diseases which we thought were uncurable.





Friday, March 6, 2015

Summative questions genetics

1. In my opinion your environment influences more who you are because even though your genes affect how you look physically, you can always change how you look depending on how you were raised. If you were raised to think that you are perfect how you are, you won't change anything. If you were raised to think that you are not pretty, then you will probably have a operation. If you were born to look at life one way, then that influences how you are and think. You don't think one just because of how you look.

2. If DNA does not copy itself exactly there can be a mutation. Mutations can cause diseases or just change in hair color. Some of the ways that mutations can happen are: duplication which is when one of the nucleotides is duplicated in mitosis. Another way is deletion which is when one nucleotide is erased in mitosis. Mutations can cause diseases like progeria which causes nucleotides to create a protein called progeria which causes cells to break down more easily than normal. Also, sickle cell anemia is caused when a gene is duplicated in mitosis.

3. One advantage of asexual reproduction is that it is fast and easy to reproduce. For example, when a starfish breaks off a arm, the arm grows into another starfish and the parent starfish grows back the arm. A disadvantage of asexual reproduction is that becuase all of the species is genetically identical, if a disease comes it can wipe out the whole species very quickly. One advantage of sexual reprduction is that the baby is protected from predators and the outside world while it grows. A disadvantage of sexual reproduction is that both the baby can the mother can be harmed or killed in the process of the birth.

Wednesday, February 25, 2015

Mutation lab question


I didn't really know how to do translocation so this is what I did.

Mutations can affect us humans in good ways. For example we could develop to survive harsher temperatures and underwater by growing a thicker skin coat and gills. But there are also bad mutations. For example you showed us a cat that was born with 2 heads and couldn't survive because the heart couldn't support both heads. Also, it can be bad because it can cause lethal diseases. It also benefits because it might make us do things that we never thought of doing.

Monday, February 23, 2015

Oreo lab question

It is very important for cells to copy their dna exactly because if they don't there will be a mutation and that can lead to cancer and other lethal sicknesses . Also the cells won't function correctly because there will be a stomach cell in a skin tissue if they are not copied exactly.

Friday, February 13, 2015

monster creation lab

1.because everybody in a society can have the same dominant genotype of brown eyes so because it is dominant it becomes the phenotype and everybody ends up with the same brown eyes.

2. Yes because if two recessive genotypes come together they will be different from the parents. Everyone has one recessive genotype so if those two come together it becomes a child with traits different from both parents.