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Search results 2001 - 2010 of 2219 matching essays
- 2001: The Human Cloning Controversy
- ... Cloning Controversy What is cloning and a clone? The dictionary says cloning is the technique of producing a genetically identical duplicate of an organism. A clone is all descendants derived asexually (having no sex or sexual organs; sexless) from a single individual, as by cuttings, bulbs, by fission , by mitosis , or by parthenogenesis reproduction. In general human cloning is the "identical twin of another person" (Vere 1). Science fiction movies, filmmakers ...
- 2002: Cladocerans
- ... vestigial in females and not much larger in males. Cladocerans are parthenogenic and for most of the year populations consist entirely of females which reproduce asexually. As winter (or sometimes spring) approaches males appear and sexual reproduction occurs typically involving the production of resistant, over-wintering eggs. Such eggs are usually enclosed in a purselike ephippium that rests in the sediment at the bottom of the lake or pond until spring ...
- 2003: The Theory of Evolution
- ... reptilian creatures had soft eggs. The eggs were laid in an aqueous substance [such as water], and fertilized externally. But, the reptilian egg is completely different. First, the reptilian eggs are fertilized internally. So, new sexual organs are needed, as well as new instinct so the animal can make use of these organs. Not only are new organs, and new instinct required, an entirely new mating process needs to take place ...
- 2004: Bioethics of Cloning
- ... movie “Multiplicity” (Mario, Christopher). The ethical, legal, and moral issues aroused by cloning have been raised by previous projects, and are now simply emerging again, with its focus on three major points: the shift from sexual reproduction with that of asexual replication of existing genes; the ability to predetermine the genes of a child; and the ability to create many genetically identical children (Report/Recommendations of the NBAC). The public responded ...
- 2005: Tomatoes
- ... or cold tolerance, salt tolerance, higher nutrient amounts and possibly other yet undiscovered potentials. Some of these species cross readily to Lycopersicon esculentum, but a few others have compatability barriers which make gene transfer by sexual means more difficult. The genus Lycopersicon has one closely related genus Solanum (of which Irish potatoes belong) which may one day provide other useful traits provided the technology of gene transfer progresses. It was at ...
- 2006: Anthopleura Elegantissima
- ... Francis’s conclusion from this is that since they “reproduce asexually by longitudinal fission” (403), each cluster is a clone and the anemone-free areas divide contiguous clones. From studying how size is related to sexual maturity in sea anemones, Francis drew another conclusion. She states that the more the anemones weigh, the more likely they are to be sexually developed. Francis’s next experiment was to try to figure out ...
- 2007: A Study of B.F. Skinner and Behaviorism
- ... will soon learn to relax whenever they have a headache. Events that are found to be reinforcing are of two sorts. "Some reinforcements consist of presenting stimuli, of adding something-for example, food, water, or sexual contact-to the situation" (Skinner, 1953, p. 73). These we call positive reinforcers. "Others consist of removing something-for example, a loud noise, a very bright light, extreme cold or heat, or electric shock-from ...
- 2008: Eugenics
- ... of the eugenics movement on the legislature. The eugenics movement inspired many different types of laws to be passed in Congress. These laws include not only the marriage and sterilization laws, but also laws about sexual segregation and immigration restriction. As to marriage, all eugenicists across America were in agreement. They believed in the “righteous idea”16 of wiping out social defect through the marriage restrictions. This was also applied in ...
- 2009: The Monkey
- ... the buttocks (ischial callosities). In this they differ not only from the New World monkeys but also from the great apes. Monkeys differ from the lemur in that there is no restricted breeding season. After sexual maturity, males are at all times potent and nonpregnant females are under regularly monthly cycles termed menstrual cycles. The phases of each cycle may, as in many platyrrhines, scarcely be recognizable, except by behaviour, but ...
- 2010: Thoeries of Evolution
- ... individuals usually have different assortments of genes, the total number of genes available for inheritance by the next generation can be large, forming a vast store of genetic variability. This is called the gene pool. Sexual reproduction ensures that the genes are rearranged in each generation, a process called recombonation. Mutations provide the gene pool with a continuous supply of new genes; through the process of natural selection the gene frequencies ...
Search results 2001 - 2010 of 2219 matching essays
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