... estimated using the Maximum Composite Likelihood (MCL) approach, and then selecting the topology with superior log likelihood value. The tree is drawn to scale, with branch lengths measured in the number of substitutions per site. The analysis involved 19 nucleotide sequences. Codon positions included were 1st+2nd+3rd+Noncoding. All positions containing gaps and missing data were eliminated. There were a total ... the relatedness of the two species was really high. However as we moved down the phylogeny the numbers did not stay consistent. We had one number go as low as 33 and others th...

• Word Count: 2043
• Approx Pages: 8
• Has Bibliography
• Grade Level: High School

... this difference will also be translated in an overall trend that males will have greater foot lengths and hand spans. In order to take into account of this variable, equal numbers of males and females were sampled. The results of this investigation have been analysed with males and females together and each gender independently so that any differences across the sexes ... a better representation of the population and reduce the extent of any anomalies when averages are taken. Each individual was selected by random sampling. This involved numbering people and using a random number genera...

• Word Count: 3540
• Approx Pages: 14
• Grade Level: High School

... and more famous. Darwin's and Wallace's concept was based on five premises: 1) there is stability in the process of reproduction 2) in most species, the number of organisms that grow, survive, and reproduce is small compared to the number initially produced 3) in any population, there are variations that are not produced by the environment and some are inheritable 4) which individual will grow and ... , having a better condition for survival. This hypothesis was not enough, and more experiments had to be made. A British ecologist, called Kettlewell, prepared another test for this hypothe...

• Word Count: 2685
• Approx Pages: 11
• Has Bibliography
• Grade Level: High School

... residue is left behind on hands, clothes, and other surroundings. These residues can be compared to other residues. Many times when a firearm is used a criminal will destroy the firearm serial numbers. To restore serial numbers, scientists use acid to dissolve the distorted metal crystals. The distorted metal crystals liquefy at a quicker pace than non distorted metal crystals leaving the serial ... number visible. There are other tests that can be done. Dental impressions can be used to identify an unidentified victim. Bite marks on a victim can be DARDAR 3 compared to a suspect. DNA "...

• Word Count: 1793
• Approx Pages: 7
• Grade Level: High School

... . An eukaryotic cell nucleus contains a lot of DNA and protein that get together to form a chromosome. Therefore, the chromosome is the major carrier of genetic information. All species have different numbers of chromosomes and different types of genetic codes inside these chromosomes. Human beings usually have 46 different chromosomes; other species can have as little as 2 chromosomes or as many as ... amount of DNA needed by a cell. The cell does a second division soon after the first, which divides the number of chromosomes in the cell in half. When a cell has half the number of chrom...

• Word Count: 1220
• Approx Pages: 5
• Has Bibliography
• Grade Level: High School

... are all monosaccharides termed "simple sugars". Each has the chemical formula C6H12O6, but the arrangement of atoms and chemical groups in them is different. Monosaccharides are classified according to the number of carbon atoms they possess. Monosaccharides that have 3 carbons are termed trioses. E.g. glyceraldehyde and dihydroxyacetone, (used in respiration). Monosaccharides with 5 carbon atoms are called pentoses. E.g. ribose ... called a pyranose ring. When 2 monosaccharides are joined by means of a condensation reaction they form a disaccharide. (See diagram below) Polysaccharides ...

• Word Count: 1520
• Approx Pages: 6
• Grade Level: High School

... In the initial stage of HIV infection, the virus colonizes helper T cells, specifically CD4+ cells, and macrophages, while replicating itself relatively unnoticed. As the amount of the virus soars, the number of helper cells falls; macrophages die as well. The infected T cells perish as thousands of new viral particles erupt from the cell membrane. Soon, though, cytotoxic T and B lymphocytes kill ... viruses known. HIV's high replication rate further increases the odds that a mutation useful to the virus will arise. To fully appreciate the extent of HIV multiplication, look at the numbe...

• Word Count: 2172
• Approx Pages: 9
• Grade Level: High School

... that they are able to repair or correct these flaws allowing them to clone at a mass rate. "These cells can be used to make unlimited number of exact duplicates of the animal that they are derived from." (Daniel Pendick, August 16, 1997) The ABS team also claims a high success ... that produce pharmaceuticals in their milk." (Daniel Pendick, August 16, 1997) While using cloning, scientists are able to genetically alter the animal's genes in large numbers so this will speed up the process. (Daniel Pendick, August 16, 1997) A study presented at a meeting of the International Embryo Transfe...

• Word Count: 3207
• Approx Pages: 13
• Has Bibliography
• Grade Level: High School

... be developed. Computers have made the techniques used to match fingerprints very easy. Until recently, the old way was the Henry Classification System. This was a big sequence of letters and numbers broken down into several levels of classification. It could take weeks or months to compare a suspect fingerprint to a department's print files. Prints can be scanned directly into a computer, doing away ... the droplet. Cast off stains are a result of hitting. Pulling back from a blow produces a blood spatter that indicates direction, by creating an arc of blood droplets. You can determine ...

• Word Count: 2730
• Approx Pages: 11
• Grade Level: High School

... to me because it just doesn't make sense. I tried for hours to find the last knot, but I was unsuccessful. After getting use to doing the math work on paper, I made a "number" tree of a knot with seven crossings. Sure enough, I found 128 knots, which is 64 doubled. Again, I went back and tried to find the 64th knot, but still could not. I think ... last picks and I didn't know what "family tree of knots" really meant. Once I got into it though, I actually liked it because it was a challenge. I got to do actual math with numbers on paper, which is why I like math in the first place. I fe...

• Word Count: 864
• Approx Pages: 3
• Grade Level: High School

... be many possible benefits if therapeutic cloning using human embryos is successful. Then perfectly matched replacement organs could become freely available to sick and dying people. That would save countless numbers of lives, and increase the quality of life of countless others. Three possible examples of therapeutic cloning might include the use of insulin-secreting cells for diabetes; nerve cells in ... stroke or Parkinson's disease; or liver cells to repair a damaged organ. This procedure would have a number of advantages, when compared to regular organ transplant donated by a second...

• Word Count: 2522
• Approx Pages: 10
• Has Bibliography
• Grade Level: High School

... be a great asset by itself. It could help in the aid of producing limited drugs. The drugs that can be produced by this method can be be reproduced in high numbers and distrubeted.Certain human proteins, such as insulin, are sometimes needed on demand. Unfortunately, our human bodies can not produce them on the spot. This can be very dangerous for ... has to live with the diease for the reat of their life. Lastly, genetic engineering has its agricultural benefits as well. By using genetic engineering to produce food, an unlimited number of food can be created. Its possible these days to...

• Word Count: 776
• Approx Pages: 3
• Grade Level: High School

... and the truth. Statistics The following statistics were taken from a report called, An eye for an eye. The national death-row population in 1983 was 1,137. Two years before, the number was 200 less and half as many in 1979. Florida had 189 death-row inmates, Texas had 153, Georgia and California 118 each. A dozen teenagers, 13 women, and six soldiers ... were included in those numbers. Between 1960 and 1973, the homicide rate doubled, from 4.7 murders per 100,000 people to 9.4. By 1983, the rate leveled off at 9.8 per 100,000 (Kurt,1983). The following statistics ... ...

• Word Count: 1420
• Approx Pages: 6
• Has Bibliography
• Grade Level: High School

Persuasive Essay Compare a firm, plump, juicy tomato to one that is soft and bruised. Which one would is more appealing? The first choice is most likely the number one choice; it is a Genetically Modified food. Genetically modified foods are where scientists take the good qualities of one organism, and place that gene into another organism. For instance the ... anywhere. This will provide more people with the vitamins needed. You wouldn't see as many frail people due to the lack of nutrients. As a result of using this rice, the numbers of blind people, and even death could decrease. Vegetabl...

• Word Count: 480
• Approx Pages: 2
• Grade Level: High School

... destroying the DNA-files. And this will probably be the solution, if it gets in the wrong hands. A DNA profile is a string of numbers stored on a computer. In theory it contains no more information about a person, than the numbers on a driving licence. But it contains of course your generics secrets, so it is of course valuable. It says in the text, that ... ...

• Word Count: 667
• Approx Pages: 3
• Grade Level: High School

... electron. It is negatively charged and it's mass is about 2000 times smaller than that of a neutron or electron. Usually the number or electron in an atom is the same as the number of protons. So, usually the atoms have not a positive nor negative charge, but they are neutral. Electron are not in the ... referred to as tritium. Tritium has on proton and two neutrons in the nucleus of the atom. Even though the atomic mass number may change the atomic number of hydrogen will be 1, and it will still have one proton and one electron. An isotope is an atom with the same ... Chemical bonding i...

• Word Count: 4152
• Approx Pages: 17
• Grade Level: High School

... , 2000). One benefit of the one step growth curve is that it allows the calculation of burst size (Flint, 2000). Burst size is the number of mature phage particles produced during the multiplication round. Calculation of burst size is one of the major goals in a one step growth curve experiment ... time were graphed to create the growth curve. Results After 48 hours of incubation, the plates were removed from the incubator and observed. The number of plaques per plate was determined by counting plaques. The results of the plaque assay are recorded in table1. The results of the plaque ass...

• Word Count: 2348
• Approx Pages: 9
• Has Bibliography
• Grade Level: High School

... quality of my DNA was 1.76. Mohammed obtained a similar value for his sample (1.79). The DNA concentration for the crude prep is usually not more 1 mg/ml (micro), and any numbers greater than that usually indicates contamination. In our case, the DNA quality reading is expected to be greater than 1 because we have RNA in our samples, which also absorbs at ... ...

• Word Count: 811
• Approx Pages: 3
• Grade Level: High School

... are using. We need to stop companies from using the products that can be harmful to our ozone. If we don't take more responsibility, we will continue to have larger numbers of health issues, and ultimately we won't have earth to live on. We know the causes; we know how it can affect us, now we need to protect our future ... ...

• Word Count: 1026
• Approx Pages: 4
• Has Bibliography
• Grade Level: High School

... , having a better condition for survival. This hypothesis was not enough, and more experiments had to be made. A British ecologist, called Kettlewell, prepared another test for this hypothesis. He placed equal numbers of light and dark colored moths in two types of areas. In one area, trees were normally colored. In the other area, they were blackened by soot. Later on, he ... ...

• Word Count: 1784
• Approx Pages: 7
• Grade Level: High School

... of polymorphism in medicine, which are silent variations between the genomes of different people. DNA tests also work with sites in DNA that have different lengths because of their variable numbers of repeated units (VNTRs) (Housman 543). The VNTRs are where DNA goes into "the genetic equivalent of a computer programming loop" and copies itself repeatedly. This takes place at the end ... ...

• Word Count: 1919
• Approx Pages: 8
• Has Bibliography
• Grade Level: High School

... biological outcomes can appear in humans too; for that reason, many Western societies have made it illegal for first cousins to marry" (Krogh 258). There is not a problem keeping population numbers up, but finding animals to breed that are not related to one another. It is likely that defects would arise for no other reason than the ability is not good ... ...

• Word Count: 1655
• Approx Pages: 7
• Has Bibliography
• Grade Level: High School

... side of the world scientists made a startling discovery with experimentation on a virus to render mice infertile. This was an experiment solve the problem of controlling the mice populations where their numbers are a problem to the grain supplies. These scientists took a mouse pox virus and spliced in a section of mouse genome that codes for the production of interleukin-4 in the hopes that ... ...

• Word Count: 1207
• Approx Pages: 5
• Has Bibliography
• Grade Level: High School

... is not very popular because embryos can only be split a few times therefore can only produce a few clones. The second technique, somatic nuclear replacement, has the potential to create endless numbers of the same person. It involves transferring DNA from a person's cell to a genetically blank egg. Scientists would need two cells. One cell is a body cell from the individual the wish ... ...

• Word Count: 1797
• Approx Pages: 7
• Has Bibliography
• Grade Level: High School

... it cost effective? Will it succeed? What affect will it have on the scientific enterprise itself? Will it funnel scientists in a scientific/technical project which, when done, will leave large numbers of scientists unemployed or underemployed? What will insurance companies or employers do with the information gained from genetic screening? Will insurance coverage or employment possibilities be affected by such screening ... ...

• Word Count: 2310
• Approx Pages: 9
• Grade Level: High School