.... still unknown, although there seems to be some relatedness to maternal age. There are two other types of Down syndrome, mosaicism and translocation, but these do not affect individuals as frequently as non-disjunction. Mosaicism is a mixture of two cell types, leaving the individual with some normal chromosomes of 46, and some affected ones with 47. Translocation occurs when part of the twenty-first chromosome breaks off and attaches to another cell. The total number of chromosomes is 46, however the excess material from the twenty-first chromosome results in the affects of the syndrome. With translocation, most cases occur sporadically, with .....

.... have observed interesting results, including that it causes structural changes in the brain, depresses male sperm counts, causes chromosome damage, lowers testosterone levels, and damages the lungs. Most of these claims, however, have been unreplicated in humans or have been contradicted by other work. This section will address each of these reported negative side-effects. Various studies have claimed that cannabis destroys brain cells. However, several other studies found no structural or neurochemical atrophy in the brain at all. Furthermore, it should be noted that Heath's work was sharply criticized for avoiding safeguards of bias and reporting "chang .....

.... list. Biological proteins would be able to be produced to cure people with diseases like diabetes, Parkinson’s and Cystic Fibrosis. Pigs could be cloned to produce organs that would not be rejected by humans. Cloning could give couples who would like children, but could not have any, a chance to have them. This process would also let single women have a child without using in-vitro fertilisation or artificial insemination. Cloning could also make a copy of a deceased child for the parents. Also it would be a very useful tool for historians as people such as Hitler would be able to be recreated and studied to find out what their motivations were. Besides .....

.... girl isn't alone in beating the odds. Genetic engineering has grown and become more common. People with diseases, infertile men, and farmers especially should recognize the many benefits from genetic engineering. They could end up with a cure a lot faster and find easier ways of getting treatment to healthier foods. From this kind of example, genetic engineering should be a known and accepted practice. It is a safe way to create good quality foods, create new lives, and cure diseases. In May of 1994, the Food and Drug Administration approved a genetically engineered tomato called “Flavr Savr”. Many people cringe at the thought of eating them. T .....

.... matter has collapsed in on itself, it becomes a black hole(Filkin 202). After being compressed infinitely, almost to nothing, the point in space that it makes is called a singularity(Filkin 216). The singularity is the bottom of the black hole. Every stellar body has an escape velocity(Intro. to Black Holes 1). The escape velocity is the speed at which one must be going to escape the gravity of the object in question(Intro. to Black Holes 1). The Earth’s escape velocity is seven miles per second(Intro. to Black Holes 1). This means that to leave the Earth’s gravitational pull, you must be able to travel at least seven miles per second(Intro .....

.... to escape were given to the subject on each day consecutively without correction and all actions were recorded to help in establishing the baseline. The total number of opportunities was fifteen a day. Every time the action occurred, the subject was immediately picked up and placed back inside the house. Day's five through eight were designed to truly concentrate on implementing the developed program with the same number of opportunities to escape as the previous four days. RESULTS It was determined that the subject would almost always attempt to escape from the house when it was given the opportunity during the first four days. As the days progres .....

.... in getting laws changed. In subsequent years, laws against birth control gradually weakened, and more effective methods were developed. Now a days there are several different methods of birth control. The first that I am going to talk about is called the rhythm method. As its synonym implies, this method is based on the assumption that, for each women, there is a rhythmic pattern of menstruation and ovulation that can be identified by keeping a careful record of the dates of menstruation. A second assumption is that ovulation occurs 14 days before the onset of the next menstruation. The rhythm method is the most commonly used of the natural methods. T .....

.... different inbred varieties. The vigour of the hybrid plant is probably a major contribution to the increased corn output in the United States. This increased output represents a major achievement for applied genetics. In 1929 practically no hybrid corn was grown among the 100 million acres of corn in the United States. But by 1970 the vast majority of 67 million acres was planted with the hybrid variety, yielding twice as much corn. Plant breeders have a definite advantage over animal breeders, because they can often produce fertile varieties - indeed, new species - by crossbreeding between species. This is because hybrids are often polypoid. Pol .....