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Aditi V.

Media #3 - 1 views

www.pages.drexel.edu/~rm35

Nature vs Nurture Aditi op-eds and blogs

shared by Aditi V. on 26 Feb 13 - No Cached
  • purvivora on 07 Mar 13
     
    not exactly sure this is an oped or a blog
Aditi V.

Media #1 - 0 views

www.behavioral.net/...new-findings-nature-vs-nurture

Nuture vs Nurture Aditi Science Article

shared by Aditi V. on 26 Feb 13 - No Cached
  • purvivora on 07 Mar 13
     
    ok
Alisa H

Behavioral Genetics--A second look at twin studies - 0 views

www.apa.org/...second.aspx

Nature vs Nurture Alisa Technique

shared by Alisa H on 01 Mar 13 - No Cached
  • The classical twin study design relies on studying twins raised in the same family environments. Monozygotic (identical) twins share all of their genes, while dizygotic (fraternal) twins share only about 50 percent of them. So, if a researcher compares the similarity between sets of identical twins to the similarity between sets of fraternal twins for a particular trait, then any excess likeness between the identical twins should be due to genes rather than environment.Researchers use this method, and variations on it, to estimate the heritability of traits: The percentage of variance in a population due to genes. Modern twin studies also try to quantify the effect of a person's shared environment (family) and unique environment (the individual events that shape a life) on a trait.The assumptions those studies rest on--questioned by some psychologists, including, in recent work, Jaccard--include:
Abraham H

Forensic Techniques [Media 4] - 0 views

www.ornl.gov/...forensics.shtml

abraham hew Forensic DNA media 4

shared by Abraham H on 01 Mar 13 - Cached
  • RFLP is a technique for analyzing the variable lengths of DNA fragments that result from digesting a DNA sample with a special kind of enzyme. This enzyme, a restriction endonuclease, cuts DNA at a specific sequence pattern know as a restriction endonuclease recognition site. The presence or absence of certain recognition sites in a DNA sample generates variable lengths of DNA fragments, which are separated using gel electrophoresis. They are then hybridized with DNA probes that bind to a complementary DNA sequence in the sample. RFLP was one of the first applications of DNA analysis to forensic investigation. With the development of newer, more efficient DNA-analysis techniques, RFLP is not used as much as it once was because it requires relatively large amounts of DNA. In addition, samples degraded by environmental factors, such as dirt or mold, do not work well with RFLP.
  • PCR Analysis Polymerase chain reaction (PCR) is used to make millions of exact copies of DNA from a biological sample. DNA amplification with PCR allows DNA analysis on biological samples as small as a few skin cells. With RFLP, DNA samples would have to be about the size of a quarter. The ability of PCR to amplify such tiny quantities of DNA enables even highly degraded samples to be analyzed. Great care, however, must be taken to prevent contamination with other biological materials during the identifying, collecting, and preserving of a sample.
  • Short tandem repeat (STR) technology is used to evaluate specific regions (loci) within nuclear DNA. Variability in STR regions can be used to distinguish one DNA profile from another. The Federal Bureau of Investigation (FBI) uses a standard set of 13 specific STR regions for CODIS. CODIS is a software program that operates local, state, and national databases of DNA profiles from convicted offenders, unsolved crime scene evidence, and missing persons. The odds that two individuals will have the same 13-loci DNA profile is about one in a billion.
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  • Mitochondrial DNA analysis (mtDNA) can be used to examine the DNA from samples that cannot be analyzed by RFLP or STR. Nuclear DNA must be extracted from samples for use in RFLP, PCR, and STR; however, mtDNA analysis uses DNA extracted from another cellular organelle called a mitochondrion. While older biological samples that lack nucleated cellular material, such as hair, bones, and teeth, cannot be analyzed with STR and RFLP, they can be analyzed with mtDNA. In the investigation of cases that have gone unsolved for many years, mtDNA is extremely valuable. All mothers have the same mitochondrial DNA as their offspring. This is because the mitochondria of each new embryo comes from the mother's egg cell. The father's sperm contributes only nuclear DNA. Comparing the mtDNA profile of unidentified remains with the profile of a potential maternal relative can be an important technique in missing-person investigations.
Kareena M

Kareena- "Forensic DNA"- Cutting Edge Technique - 0 views

www.exploredna.co.uk/-dna-forensics-techniques.html

Kareena Forensic DNA Technique

shared by Kareena M on 01 Mar 13 - No Cached
  • Polymerase Chain Reaction (PCR) Analysis PCR analysis is a technique that allows technicians to create millions of precise DNA replications from a single sample of DNA. In fact, DNA amplification alongside PCR can let forensic scientists perform DNA analysis on samples that are as tiny as only a couple of skin cells. In contrast to some other DNA analysis techniques, PCR analysis has the advantage of analysing minuscule sample sizes, even if they are degraded although they must not be contaminated with DNA from other sources during the collection, storage and transport of the sample.
Dohyun Y

ABC NEWS: Stem Cells Cure Blindness - 2 views

www.youtum9dOhgA5uIgbe.com/watch

stem cells DoHyun Tvnews

shared by Dohyun Y on 16 Feb 13 - No Cached
  • purvivora on 25 Feb 13
     
    please ask your partners to help you tag your post properly.What kind of medium is this? Blog? Article?
  • purvivora on 25 Feb 13
     
    Link does not work
  • Dohyun Y on 01 Mar 13
Aditi V.

Media #2 - 0 views

www.youtube.com/watch

Nature vs Nurture Aditi Science Article

shared by Aditi V. on 12 Feb 13 - No Cached
  • Alisa H on 12 Feb 13
     
    This is about the Olympics where they show that usually black people are faster. Most of them run, faster which has to do somehting with genetics and it shows that it comes naturally. This has a lot to do about "Nature Vs Nurture". 82 people ran under the ten seconds and only 1 person was white.
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