Friday, March 13, 2015
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
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.