Showing posts with label jex. Show all posts
Showing posts with label jex. Show all posts

Tuesday, December 6, 2011



Today we started a new unit. Mrs. Andrews advised that we do not follow the calender she gave us, rather we follow the google docs because the calender has some errors. Due to the fact we had a shorten class period, we watched a movie on the murder of two teenagers.

On November 21st, 1983 a crime occurred in a small town in England. A teenager named Lynda was killed. She was actually sexual assaulted, strangled, and raped. Detectives spent many years trying to find the killer of this case, but nothing was drawn except the fact that the killer's blood type of was AB. Three years later in the same town, a 15 year old girl, Dawn went missing. She was later found strangled and sexual assaulted. Dawn's and Lynda's case had similarities because they were both sexually assaulted at the same place, thus they were both teenagers. Eventually a prime suspect, Richard Buckmenth, confessed of killing Dawn but not Lynda. Blood types of the Dawn's case was taken to the University of Leichester and there a member of the RFLP, Allec Jeffreys, used DNA in a murder case. He used the small part of DNA and used restriction enzymes to cut the DNA. This way the person can be figured out using DNA. It turned out, Richard's did DNA did not match the one of the real killer. Soon he was released. Allec figured that the killer had killed both Dawn and Lynda. Therefore the police sent letters for a voluntary blood test. They wanted to match the blood type of AB. A bakery owner, Colin Pitchfork, did not attend because he did not want to deal with the police again. So instead he made his friend, Eion Kelly take it by replacing his passport picture with Eion's. Eventually Eion was bragging about what he did and a lady overheard and told the police. The police eventually heard about this and soon he confessed he was the killer for both girls. All evidence, including the DNA, of this matched.

On the right is Colin Pitchfork and on the left is Lynda Mann.

Homework: Take notes on pages 200 and 208-211, UP 5-6

the next scribe is Jackson!

Tuesday, September 13, 2011

Ch. 20- Human Impact on the Enviroment

First watched one movie.
Key points:
Ecological succession
the process of biological community change resulting from disturbance; transition in the species composition of a biological community, often following a flood, fire, or volcano eruption.
There are two forms of ecological succession: primary and secondary
primary succession- community arises in a virtually lifeless area with no soil
secondary succession- occurs where a disturbance has destroyed an existing community but left the soil intact
Ex. of primary succession: glaciers, starting clean slate
Ex. of secondary succession: fire, landslides, farming
There are three steps in primary succession: 1. lightens 2. colonize 3. mature forest
Solid rock supports life because primary succession starts on rocks. Soon soil formation break the rock's edges and then early colonizers like fungi and low levels of nitrogen grow creating a mature forest. A mature forest consists of a diversity of tree species, slow growing, as well as more nutrients.
Basically creation of barren land is succession.

Picture: http://www.google.com/imgres?q=ecological+succession&um=1&hl=en&sa=N&biw=1280&bih=600&tbm=isch&tbnid=OaPJSybzX76IpM:&imgrefurl=http://berdengbabaesaabudhabi.blogspot.com/&docid=-1Mm7cQ136LHKM&w=480&h=332&ei=gQxwTtjOIsqmsALBuNi4CQ&zoom=1&iact=hc&vpx=296&vpy=299&dur=251&hovh=187&hovw=270&tx=135&ty=101&page=1&tbnh=113&tbnw=165&start=0&ndsp=19&ved=1t:429,r:8,s:0

Notes:
Humans have greatest impact on the communities worldwide. Examples include logging, cleaning for housing, farming, reduction of species diversity

picture:http://www.google.com/imgres?q=logging&um=1&hl=en&biw=1280&bih=600&tbm=isch&tbnid=1Hr-7nAVQw0YjM:&imgrefurl=http://6452ck.edublogs.org/2008/06/02/logging-pictures/&docid=vA2gUiZbTyR0IM&w=500&h=328&ei=8gxwTqC_HeGosAKN1LXnCQ&zoom=1&iact=hc&vpx=156&vpy=180&dur=172&hovh=182&hovw=277&tx=145&ty=73&page=1&tbnh=112&tbnw=149&start=0&ndsp=21&ved=1t:429,r:0,s:0

Environmental problems:
Introduced species: humans accidentally or intentionally move species which they prey on native organisms and out compete native species.
e.x. zebra mussels, fungus, European starlings..
Eutrophication: over fertilization of lakes because sewage outflow, agricultural fertilizers, and pesticides which create heavy algal and bacteria which can suffocate aerobic life including fish.
Deforestation: amount of nutrients leaving an intact forest ecosystem is controlled by plants: no trees=loss of nutrients
Toxic chemical: Store up in fat and magnify up the food chain which creates biological magnification
e.x. DDT, PCB, mercury
Global Warming- marked increase in atmospheric CO2 concentrations because of burning of fossil fuels and wood/deforestation
warming of 2 degrees C=melting of polar ice caps, raise sea level, coastal cities would be underwater, alter precipitation affecting agriculture
Ozone Layer Depletion- Use of chlorofluorocarbons(refrigeration and aerosol cans)
ozone layer protects us from IV radiation which could increase incidence of skin cancer, cataracts, damage crops, and phytoplankton.
ozone layer over Antarctica
Biodiversity Crisis: decline of Earth's diversity in ecosystems
losing species
3 main reasons:
habitat destruction(land, wetland)
introduced species-eliminate native species(starlings and pigeons replaced native birds)
Overpopulation-too much harvest or hunting(whales, rhino, marine turtles)

pictures: http://www.google.com/imgres?q=deforestation+in+india&um=1&hl=en&biw=1280&bih=600&tbm=isch&tbnid=a_vtWVtyFs_KHM:&imgrefurl=http://wn.com/deforestation%3Fupload_time%3Dall_time%26orderby%3DviewCount&docid=X2qrBhQkVAu1QM&w=468&h=312&ei=VxFwToauNsfK0AHs5NziCQ&zoom=1&iact=hc&vpx=499&vpy=303&dur=1578&hovh=183&hovw=275&tx=115&ty=122&page=1&tbnh=109&tbnw=157&start=0&ndsp=20&ved=1t:429,r:9,s:0

http://www.google.com/imgres?q=global+warming&num=10&um=1&hl=en&biw=1280&bih=600&tbm=isch&tbnid=LOXaBo-lscTJgM:&imgrefurl=http://www.spiritofmaat.com/announce/ann_dryice.htm&docid=A8TLSdyqVl5DeM&w=500&h=330&ei=eBFwTp3RDvCNsAK00t3xCQ&zoom=1&iact=hc&vpx=724&vpy=179&dur=1563&hovh=182&hovw=276&tx=181&ty=113&sqi=2&page=1&tbnh=109&tbnw=148&start=0&ndsp=22&ved=1t:429,r:4,s:0

http://www.google.com/imgres?q=ozone+layer+depletion&num=10&um=1&hl=en&biw=1280&bih=600&tbm=isch&tbnid=Jcf6inn5WEv__M:&imgrefurl=http://js082.k12.sd.us/My_Classes/Physical_Science/Phys_Sci_ch_7/ozone_layer_depletion.htm&docid=kN2ABKWnRD_wQM&w=288&h=289&ei=wBFwToWlLeSksQKnvvDcCQ&zoom=1&iact=hc&vpx=619&vpy=160&dur=3211&hovh=225&hovw=224&tx=86&ty=120&sqi=2&page=1&tbnh=114&tbnw=133&start=0&ndsp=21&ved=1t:429,r:3,s:0

Next..sean