Today was a more laid back day in biology class. Basically we reviewed what we went over on Friday and took a few notes on our next section; the early history of earth. Basically all we got was that when the earth was first formed which was about 4.5 billion years ago, the atmosphere was composed of CO2, N2, water vapor, CH4, and H25. The first organic molecules were proven to exist if the atmosphere was as how it was believed to be. Two scientists proved this by conducting an experiment. In it they reproduced the conditions of what the atmosphere was believed to be like in ancient earth. They then sent electric sparks into the solution as if it were lightning. They next took a sample of the water that had formed and let it sit. After about two weeks, amino acids had started to form. this proves that if the atmosphere was what it was in the experiment then that's how the amino acids formed, starting a chain effect that would eventually lead to the development of DNA and RNA.
We did a short lab to demonstrate radioactive decay. We took 100 m&m's in a cup and shook the cup for 10 seconds. We then poured out the m&m's onto a plate and removed all the ones with the m symbol facing up. we the put the m&m's remaining back into the cup and repeated the earlier steps until there was none left. If you looked at the chart we filled out it would show that about each time we removed m&m's there was about half of them left this saying that the 10 seconds was like the half life of the substance that the m&m's represented.
The HW is...-UP 31 and 32
- 2.6 and check my understanding chart (due Wednesday)
-work on your TV add
-test Friday!!!!
The next scribe will be......... Mirella!!!
Showing posts with label AmandaB. Show all posts
Showing posts with label AmandaB. Show all posts
Monday, February 7, 2011
Sunday, February 6, 2011
What?!?!? Evolution involves Genatics?
Today in biology class, we talked about way that a species can eventually become two or mare than that. Basically it is all in the genetics, I genes change then the species becomes different. How or why do the genes change? Well one main reason is genetic drift. Genetic drift is when a number of species are moved to a different environment or the environment changes very fast in a small amount of time. This causes the animal to adapt in order to survive, or natural and/or artificial selection takes place. Over time the species becomes different creating a whole new species.
We also talked about other things like speciation. This is the ways a species evolves over time. There are two ways a species can evolve: punctuated equilibrium and gradualism. Punctuated equilibrium is when a species has long periods of stability and the short periods of rapid change. Gradualism is when a species changes at a slow steady rate. For this to happ3en you need several things; you need complete isolation and that the organism, and the organism cannot interbreed with another species.
Another thing that can spark a movement to change in a species is adaptive radiation. Adaptive radiation is when a species changes due to environment. If the environment changes so does the species in order to survive. One prime example is the finches on all the Galapagos Islands. They are slightly different on each island.
We also brushed over some other topics, these include;
Convergent Evolution: two different species, that are similar due to living in the same environment (ex. Butterflies and birds).
Co-evolution: organisms with close ecological relationships (ex. Plants and insects)
We then shifted subjects, and moved onto dating (not the kind where two people go out, but the kind to tell how old a fossil is). There are two ways scientists can tell how old a fossil is. One way is relative dating. Relative dating is were scientists look at the layer of rick or ground were the fossil is found, and depending on how old the layer is, that’s how old the fossil should be. The other way is through carbon dating. Since all thing need carbon, everything will have carbon in it. One an organism dies, it stops creating carbon. The carbon then starts to decompose. Carbon 14 and any other chemical will always decompose at the same rate. For carbon, half will be gone in 5770 years. This is known as a half life. A half life is how long it takes for half the mass of a chemical to decompose. So to tell how old a fossil is all you need to do is know how much carbon was originally there, know how much is left and then by counting half lives you can tell how old a fossil is. The only drawback is if there is not enough carbon then this wont work.
Don’t forget the homework!!:
-Read 19.3 and do a flow map on that
-finish UP 33-35
- Also don’t forget about your TV add due 2/28
-Test Wednesday
Here are some useful videos if you need any additional help;
http://www.youtube.com/watch?v=81dWTeregEA
This one explains carbon dating well
http://www.youtube.com/watch?v=tKj2s3VVI0M
This one show great example of Convergent evolution for animals with wings.
We also talked about other things like speciation. This is the ways a species evolves over time. There are two ways a species can evolve: punctuated equilibrium and gradualism. Punctuated equilibrium is when a species has long periods of stability and the short periods of rapid change. Gradualism is when a species changes at a slow steady rate. For this to happ3en you need several things; you need complete isolation and that the organism, and the organism cannot interbreed with another species.
Another thing that can spark a movement to change in a species is adaptive radiation. Adaptive radiation is when a species changes due to environment. If the environment changes so does the species in order to survive. One prime example is the finches on all the Galapagos Islands. They are slightly different on each island.
We also brushed over some other topics, these include;
Convergent Evolution: two different species, that are similar due to living in the same environment (ex. Butterflies and birds).
Co-evolution: organisms with close ecological relationships (ex. Plants and insects)
We then shifted subjects, and moved onto dating (not the kind where two people go out, but the kind to tell how old a fossil is). There are two ways scientists can tell how old a fossil is. One way is relative dating. Relative dating is were scientists look at the layer of rick or ground were the fossil is found, and depending on how old the layer is, that’s how old the fossil should be. The other way is through carbon dating. Since all thing need carbon, everything will have carbon in it. One an organism dies, it stops creating carbon. The carbon then starts to decompose. Carbon 14 and any other chemical will always decompose at the same rate. For carbon, half will be gone in 5770 years. This is known as a half life. A half life is how long it takes for half the mass of a chemical to decompose. So to tell how old a fossil is all you need to do is know how much carbon was originally there, know how much is left and then by counting half lives you can tell how old a fossil is. The only drawback is if there is not enough carbon then this wont work.
Don’t forget the homework!!:
-Read 19.3 and do a flow map on that
-finish UP 33-35
- Also don’t forget about your TV add due 2/28
-Test Wednesday
Here are some useful videos if you need any additional help;
http://www.youtube.com/watch?v=81dWTeregEA
This one explains carbon dating well
http://www.youtube.com/watch?v=tKj2s3VVI0M
This one show great example of Convergent evolution for animals with wings.
Monday, December 6, 2010
Things may be more than they seem…
Today in Mrs. Stein’s biology class we learned about multiple alleles. Multiple alleles are a gene with two or more possible varieties. The most common example is the human blood types A, B, AB, and O. in theses blood types, types A and B are codominant, and type O is recessive.
A fun fact about blood types is that they are defined by what antigens are on the red blood cells.
We also talked about genetic disorders. There are three types of genetic disorders:
-Chromosome abnormalities- a mess up in the chromosomal order. A major example of this is Downs Syndrome.
-Single gene disorders-were a mutation is on only one gene
-Sex linked disorders- these are disorders in the chromosomes that determine the gender of an organism.
Here are some major facts about genetic disorders:
-they are a mutation in the DNA
-there are 22pairs of autosomes and 1 pair of sex chromosomes.
-many genetic disorders are autosomal and recessive
We then went on to talk about sex linked disorders; here are some facts about them:
-sex linked disorders are on the X chromosome only (in the sex pair there is either
XX-female or XY- male) and many are recessive.
-hemophilia, colorblindness, muscular dystrophy, and baldness are all examples of sex linked disorders.
In order of diseases to show in a woman she must have the disease on both Xs (XaXa), and only on the one x for men (YXa). So women can be carriers(XAXa), but men cannot.
We then quickly covered pedigrees before the bell rang. All pedigrees are, are what is used to trace a disease through family. And that’s when the bell rang ending class.
Here are some links to some videos if you need them:
This one explains a lot a bout how to use multiple alleles in a punnet squarehttp://www.youtube.com/watch?v=ROL5ekow-Y4
This one shows more on how a genetic disorder occurs and how it affects peoplehttp://www.youtube.com/watch?v=8s4he3wLgkM
This one shows some diferent types of genetic disordershttp://www.youtube.com/watch?v=eHQiwX5SSgM
The next scribe will be Michael D.
A fun fact about blood types is that they are defined by what antigens are on the red blood cells.
We also talked about genetic disorders. There are three types of genetic disorders:
-Chromosome abnormalities- a mess up in the chromosomal order. A major example of this is Downs Syndrome.
-Single gene disorders-were a mutation is on only one gene
-Sex linked disorders- these are disorders in the chromosomes that determine the gender of an organism.
Here are some major facts about genetic disorders:
-they are a mutation in the DNA
-there are 22pairs of autosomes and 1 pair of sex chromosomes.
-many genetic disorders are autosomal and recessive
We then went on to talk about sex linked disorders; here are some facts about them:
-sex linked disorders are on the X chromosome only (in the sex pair there is either
XX-female or XY- male) and many are recessive.
-hemophilia, colorblindness, muscular dystrophy, and baldness are all examples of sex linked disorders.
In order of diseases to show in a woman she must have the disease on both Xs (XaXa), and only on the one x for men (YXa). So women can be carriers(XAXa), but men cannot.
We then quickly covered pedigrees before the bell rang. All pedigrees are, are what is used to trace a disease through family. And that’s when the bell rang ending class.
Here are some links to some videos if you need them:
This one explains a lot a bout how to use multiple alleles in a punnet squarehttp://www.youtube.com/watch?v=ROL5ekow-Y4
This one shows more on how a genetic disorder occurs and how it affects peoplehttp://www.youtube.com/watch?v=8s4he3wLgkM
This one shows some diferent types of genetic disordershttp://www.youtube.com/watch?v=eHQiwX5SSgM
The next scribe will be Michael D.
Thursday, September 23, 2010
Thursday, August 26, 2010
First Two Days of School
Wed. Aug. 25th
Today in biology class, we talked about what science is. some ideas were the study of nature, something you can prove, the study of everything, and questions we ask about stuff. We also talked about what a hypthesis is. some answers for that were an educated guess, if this happens then this will, and an opinion on something we observe. After that we tested hypothesises by doing what is called milk lab. We took a bowl of milk and dropped four different colors of food dye in it. we the dipped toothpick in to see what would happen. we then did it agian this time putting dish soap on the toothpick. and again with a lot more soap and held it ther for a minute. before each of these steps we made a hypothesis on what would happen. by then the class was almost over so we filled in all the analysis questions we could before it ended.
Thurs. Aug. 26th
on our second day of Bio, our teacher told us more about what we were going to be doing throught the year. after that we got everyone set up on the school computer system and got set with moodle. of couurse ther was some confution getting set up so that took a while and when we finished there were a few minutes left were we watched a few videoes on internet saftey. then almost as soon as the last video was done the bell rang ending class.
The next scribe is Zoe
Today in biology class, we talked about what science is. some ideas were the study of nature, something you can prove, the study of everything, and questions we ask about stuff. We also talked about what a hypthesis is. some answers for that were an educated guess, if this happens then this will, and an opinion on something we observe. After that we tested hypothesises by doing what is called milk lab. We took a bowl of milk and dropped four different colors of food dye in it. we the dipped toothpick in to see what would happen. we then did it agian this time putting dish soap on the toothpick. and again with a lot more soap and held it ther for a minute. before each of these steps we made a hypothesis on what would happen. by then the class was almost over so we filled in all the analysis questions we could before it ended.
Thurs. Aug. 26th
on our second day of Bio, our teacher told us more about what we were going to be doing throught the year. after that we got everyone set up on the school computer system and got set with moodle. of couurse ther was some confution getting set up so that took a while and when we finished there were a few minutes left were we watched a few videoes on internet saftey. then almost as soon as the last video was done the bell rang ending class.
The next scribe is Zoe
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