... the production of the hydroxyl free radical, which is the most reactive when compared to the superoxide free radical and hydrogen peroxide (DNA Learning Center). Once the hydroxyl free radical is produced, it can then go to attack all other cell components. For example, hydroxyl free radicals can attack the proteins (or the mtDNA that codes for those proteins) in the electron ... under two categories: 1) inherited and 2) caused by random somatic mutations throughout life. In the case of an inherited mtDNA-related disease, it is inherited from the mother because the mother's egg is the o...

• Word Count: 2319
• Approx Pages: 9
• Has Bibliography
• Grade Level: Undergraduate

... mitosis begins, chromosomes condense, they become visible under a light microscope. They appear as sister chromatids joined at the centromere. The number of centromeres is the same number of chromosomes in a cell. Centrosomes begin moving apart as the nuclear envelop disintegrates and the nucleolus begins to disappear. Spindle is in the process of forming in late prophase. This is when the centromeric ... a particular orientation yet. Metaphase is the stage of mitosis when the fully formed spindle consists of poles, asters, and fibers. Centrioles may help organize the spindle as in an an...

• Word Count: 1084
• Approx Pages: 4
• Grade Level: Undergraduate

... sound frightening, genetic research has far more advantages than downfalls. With recent advancements in the mapping of the human genome, it will soon be possible to identify particular strings of DNA which may cause diseases like cancer or amyotrophic lateral sclerosis. Commonly known as ALS or Lou Gehrig's Disease, amyotrophic lateral sclerosis is a neurodegenerative disease that attacks nerve cells in the ... marrow of leukemia victims. (AAAS) The stem cells used in this research can be obtained from several sources. One of these sources is the embryonic stem cell, which is a cell har...

• Word Count: 2597
• Approx Pages: 10
• Has Bibliography
• Grade Level: Undergraduate

... cloned mammal which was a healthy lamb by the name of "Dolly". A process called somatic nuclear cell transfer accomplished this task. For example, a cell is first taken from a donor female, then an unfertilized egg is taken from a second female, DNA from the cell is removed and transferred to the egg which is implanted into a surrogate mother, and finally the resulting baby is genetically identical to the ... (Global change). Many Senators support the research, but not the actual reproductive cloning and are currently trying to pass bills protecting the rights for research. "Human Clonin...

• Word Count: 981
• Approx Pages: 4
• Has Bibliography
• Grade Level: Undergraduate

... known as therapeutic cloning. The "cloning debate" has now been joined by the "stem cell debate," and it is imperative that people appreciate the difference between Adult DNA Cloning and Therapeutic Cloning. Adult DNA cloning: (also known as somatic cell nuclear transfer) This process begins by removing an egg from a donor mother and extracting the nucleus, this creates an enucleated, essentially empty ... egg. Then, a somatic cell is taken from an individual to replace the existing nucleus and is ... electrically fused with the egg to start up its embryo making operation. (No matter ho...

• Word Count: 2187
• Approx Pages: 9
• Grade Level: Undergraduate

... . This process consists of transplanting, or injecting, the nucleus of an adult body cell into an enucleated egg (oocyte) of another animal or person. Convinced that past efforts to clone mammals failed because the donor cell that supplied the nucleus and the recipient egg were at different stages of the cell cycle, Wilmut et al. cut the supply of nutrients and thereby induced the donor ... to be cloned. They would then extract the nucleus by means of a fine needle from the eggs and put the recently vacant egg and the cloner's cells next to each other, and zap them with electricity. Theo...

• Word Count: 2347
• Approx Pages: 9
• Has Bibliography
• Grade Level: Undergraduate

... Genes which, basically, contain the blueprints for our cellular structure, are grouped along rod-like structures called chromosomes. Normally, the nucleus of each cell contains 23 pairs of chromosomes, half of which are inherited from each parent. In Down syndrome (DS), however, the cells usually contain not 46 ... chromosomes. Chromosomes are thread-like structures composed of DNA and other proteins. They are present in every cell of the body and carry the genetic information needed for that cell to develop. Genes (which are units of information) are "encoded" in the DNA. "Human cells n...

• Word Count: 3980
• Approx Pages: 16
• Has Bibliography
• Grade Level: Undergraduate

... employed in cases of homosexual parents, where normal reproduction is not possible because of similarities of sexes. An egg cannot combine with another egg, and a spermatozoid cannot mix with another spermatozoid. Therefore, as mentioned previously the cloning will consist by taking a cell from either parents and duplicates it. This kind of behavior could encourage homosexuality, and worse than that, the ... as well certain non-religious moral issues that should be taken into consideration. As stated earlier, the normal fertilization of the egg by the sperm, in which each contains twenty-...

• Word Count: 1299
• Approx Pages: 5
• Has Bibliography
• Grade Level: Undergraduate

... cloning. A scientist would take an ovum from a female donor, removing the nucleus and thus leaving an "empty" egg. From there, a single skin cell (somatic cell) would be removed from either, or both, parents and the nucleus from these somatic cells would then be inserted into the " ... This number could be largely reduced worldwide through the process of Therapeutic Cloning. Starting out quite similarly to adult DNA cloning, with a nucleus inserted into an empty egg. But rather than allowing the egg carry out the process of development into a child, it's growth would be stopped around the...

• Word Count: 995
• Approx Pages: 4
• Grade Level: Undergraduate

... "mesokaryotic" because of their unusual nuclear organization. While the DNA of most other eukaryotes forms fibrils that are 10nm wide, the DNA of dinomastigotes is only 2.5 nm wide. Also, eukaryotic DNA usually only condenses during mitosis, but the DNA of organisms in this phylum is always condensed. This is ... this means the genome is turned off, but the genes of dinomastigotes continue being expressed even though their DNA is condensed. Interphase, prophase, metaphase, anaphase, and telophase do not occur during mitosis in these organisms. ... of Class Hematozoa. Apicomplexans repr...

• Word Count: 3806
• Approx Pages: 15
• Grade Level: Undergraduate

... Genetic information is the complete set of inherited instructions, or an organism's genome, for building proteins and other molecules. Inside the nucleus of each mammalian cell are pairs of chromosomes that are composed of deoxyribonucleic acid (DNA). This long, helical molecule carries all the information to direct the production of proteins. Biologists were convinced that chromosomes carry genes and genetic information, but ... in the nucleus of a cell. Nucleotide base pairs (A, T, G, and C) bond to the sugar-phosphate backbone to form the DNA double-helix molecule. The spiral helix, wi...

• Word Count: 2575
• Approx Pages: 10
• Has Bibliography
• Grade Level: Undergraduate

... ethics. Many couples who are unable to have children turn to fertility-enhancing technologies for help. Artificial insemination raised new ethical issues about how potential parents should choose sperm or egg donors, on what basis and with what guarantees of privacy should donors be enlisted, and whether donors are able to have parental rights. In 1978 the birth of the first ... inside the recipient's body rather than a freezer. It might be possible to create a new embryo using nuclear transfer technology, where the new embryo would contain the DNA of the one used in the stem cell thera...

• Word Count: 2467
• Approx Pages: 10
• Grade Level: Undergraduate

... second meiotic division of spermatogenesis" according to Dr. Robert Tissot. If chromosomes fail to separate before turning into gametes, every sperm cell will be afflicted with an extra Y chromosome. Symptoms of XYY syndrome are unusual height, average to low IQ's, and an increase ... the most affected part of the cell. In a normal cell, the nucleus contains 46 chromosomes, 23 from the egg and 23 from the sperm. In contrast, a cell infected with XYY syndrome will have 47 chromosomes in the nucleus, 23 from the egg and 24 from the sperm. This ... extra chromosome is passed onto the zygote...

• Word Count: 802
• Approx Pages: 3
• Has Bibliography
• Grade Level: Undergraduate

... regulation of the tumour suppressor gene p.53, led to a failure to repair or remove DNA damage in ovulated follicles. The gonadotropin theory postulates that 'follicle stimulating hormone or luteinizing hormone stimulate cell proliferation and malignant transformation of the ovarian epithelium' (Tung et al. 2005: 321). In ... 2000). As well as risk factors there appears to be protection factors as well, these come from the idea of stopping egg production and from increasing the amount of progesterone in the body and include pregnancy, oral contraceptives and breast feeding (Cancer Resear...

• Word Count: 3220
• Approx Pages: 13
• Has Bibliography
• Grade Level: Undergraduate

... technology probably will make possible changes in the genomes of embryos. Parents that risk having children with genetic diseases will be able to have the DNA of their prospective children repaired at the embryo stage, protecting them against maladies such as cystic fibrosis, PKU, and Tay-Sachs. A further ... for a leukemia patient could be created from the patient's own cells. Doctors could take a skin cell nucleus and implant it in an enucleated human egg2, resetting the cell's DNA. Once reset, the cell could become and embryonic stem cell3. After the ES (embryonic stem) cells began to...

• Word Count: 2464
• Approx Pages: 10
• Has Bibliography
• Grade Level: Undergraduate

... transfer involves the use of two cells. The receiving cell is normally an unfertilised egg taken from an animal soon after ovulation. The donor cell is the one to be copied. A scientist removes the chromosomes, a chain-like substance that incorporates the cell's DNA, from the recipient egg cell. The donor cell is then combined with the recipient egg. Some fused cells start to develop like a normal ... embryo and produce progeny if implanted into the uterus of a surrogate mother'. Then on October 13th 2001, human cloning research had an even bigger breakthrough. Cloned early-stage human ...

• Word Count: 1149
• Approx Pages: 5
• Grade Level: Undergraduate

... provide the codes that are used in translation to make proteins that do functions of the cell. In 1972 Paul Berg created the first Recombinant DNA. Berg did an experiment where he was able to put different DNA into cells so they would produce a different kind of protein they had not made in ... the past. In 1975 these technologies were used to develop the Southern Blotting Method for finding detecting specific DNA sequences, which has been commonly been used in proving guilt or innocence of the suspect. If there was a struggle at a murder scene between the ... the protein does, a ways i...

• Word Count: 1423
• Approx Pages: 6
• Grade Level: Undergraduate

... slice when being viewed under a microscope. More interestingly, Gorski's finding applied to the sexual orientation between males and females. That particular group of cell is known as the medial preoptic are has been involved in the sexual behaviors typically displayed in males. For instance, if there is a male ... and his colleagues at U.C.L.A, especially with his student, Dr. Laura S. Allen. They also found the dimorphic structure in the human brain. A cell group named INAH3, shorten for the third interstitial nucleus of the anterior hypothalamus, in the medial preoptic region of the h...

• Word Count: 2425
• Approx Pages: 10
• Has Bibliography
• Grade Level: Undergraduate

... would be to replace the haploid nucleus of the host egg with a donor's nucleus containing a full set of genes. Applying an electrical current would then jolt the host egg into beginning growth. If implanted in a surrogate mother, the egg could then continue through its nine-month gestation period. ... grieving parents the chance to recapture the child they have lost. A lock of hair taken from a baby book could provide the DNA necessary for cloning their daughter. Although the clone would obviously not have an identical personality to it genetic predecessor, the two would more ... actua...

• Word Count: 1094
• Approx Pages: 4
• Has Bibliography
• Grade Level: Undergraduate

... when cells are unable to produce necessary proteins needed to change certain chemicals into others or to carry substances from one place to another. The cell's inability to carry out these functions often results in mental retardation. Almost 1 in every 5000 children is born with defective enzymes resulting in this ... include cancer, high blood pressure, heart disease, diabetes, Alzheimer's disease, and obesity. Chromosomes are structures made up of DNA and protein. They are located in the nucleus of each cell. Because chromosomes are carriers of the genome, such abnormalities in chromos...

• Word Count: 354
• Approx Pages: 1
• Grade Level: Undergraduate

... numbers to produce symptoms. This is useful for testing HIV and forensic science; they only need one cell from the suspect. It can be used to copy DNA from bloodstains and semen samples in cases of assault and rape. It can be used to copy DNA from a single hair found at the scene of a crime so that a genetic fingerprint can be made that ... may lead to the identification of the criminal. It has even been used to copy DNA from Egyptian mummies, the remains of extinct animals and even a termite embalmed in amber. Enzymes and food have been natural partners since ancient times. Traditional...

• Word Count: 1120
• Approx Pages: 4
• Grade Level: Undergraduate

... are very complex and complicated machines but definitely not as complex as the human body, which is made up of cells! Every living thing is made up of DNA. When you make a copy of DNA you have a clone! A Clone is an organism, or group of organisms, derived from another organism by an asexual reproduction, reproduction without sex. Genes would come from a body ... cell of a single individual: The word clone has been applied to cells as well as to organisms, so a group of cells stemming from a single cell is also called a clone. Usually the ... members of a clone are identical in their i...

• Word Count: 369
• Approx Pages: 1
• Grade Level: Undergraduate

... who grow up together are separate people "distinct individuals with different personalities (Bailey 109). In addition, a clone that grew from one person's DNA inserted in another person's host egg would pick up "maternal factors?from the proteins in that egg (Bailey 110), affecting the clone's development, therefore a clone could not possibly be a copy of some past creature. This leads into the next ... can grow into any kind of human tissue and hold the potential to treat Alzheimer's, Parkinson's and other diseases?(McCullough), like AIDS and cancer, making society happier and healthie...

• Word Count: 2181
• Approx Pages: 9
• Grade Level: Undergraduate

... very multilayered in the promises and threats that are suggested by scientists (Kolata 8). In the basic definition, cloning is accomplished by removing the nucleus of a mature, unfertilized egg and replacing it with a specialized cell from an adult organism. The nucleus taken contains most of the hereditary material from the original human source, and it develops from the human source it was taken ... because it opens new doors for child bearing in that particular community. Asexual reproduction can use any cloning method to produce children of the couple's own cells or even the cell re...

• Word Count: 1625
• Approx Pages: 7
• Grade Level: Undergraduate