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Thursday, September 23, 2010
Tuesday, September 21, 2010
www.spotagel.com is the best adversitement site at turkey
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Sunday, September 5, 2010
Memory Book accessories by C-Line Products
Memory Book is the very good book for all people who are read in school college & uninersity
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Monday, August 30, 2010
Wednesday, August 4, 2010
BIOLOGY
Biology is the branch of science that deals with the study of living organisms the term biology is derived from the combination of two greek words –‘bios’ that mens life and ‘logos’ that means knowledge Biology is also known as science of life. The term was introduced in Germany in 1800 and popularized by the French naturalist Jean-Baptiste de Lamarck as a means of encompassing the growing number of disciplines involved with the study of living forms. The unifying concept of biology received its greatest stimulus from the English zoologist Thomas Henry Huxley, who was also an important educator. Huxley insisted that the conventional segregation of zoology and botany was intellectually meaningless and that all living things should be studied in an integrated way. Huxley’s approach to the study of biology is even more cogent today, because scientists now realize that many lower organisms are neither plants nor animals. The limits of the science, however, have always been difficult to determine, and as the scope of biology has shifted over the years, its subject areas have been changed and reorganized. Today biology is subdivided into hierarchies based on the molecule, the cell, the organism, and the population.Biology is very vast and complex subjects and the scope of biology is very wide.Biology is the study of living organisms that includes plant ,animal and micro-animal. Hance basically it has three main branchs they are
1 Botany : Branch of biology that deals with the study of plants
2 Zoology: Branch of biology that deals with the study of Animals
3 Micro-Biology : Branch of biology that deals with the study of micro-orsanisms
1 Botany : Branch of biology that deals with the study of plants
2 Zoology: Branch of biology that deals with the study of Animals
3 Micro-Biology : Branch of biology that deals with the study of micro-orsanisms
GENE
Gene is the basic unit of heredity found in the cells of all living organisms, from bacteria to humans. Genes determine the physical characteristics that an organism inherits, such as the shape of a tree’s leaf, the markings on a cat’s fur, and the color of a human hair .Genes are composed of segments of deoxyribonucleic acid (DNA), a molecule that forms the long, threadlike structures called chromosomes. The information encoded within the DNA structure of a gene directs the manufacture of proteins, molecular workhorses that carry out all life-supporting activities within a cell .Chromosomes within a cell occur in matched pairs. Each chromosome contains many genes, and each gene is located at a particular site on the chromosome, known as the locus. Like chromosomes, genes typically occur in pairs. A gene found on one chromosome in a pair usually has the same locus as another gene in the other chromosome of the pair, and these two genes are called alleles. Alleles are alternate forms of the same gene. For example, a pea plant has one gene that determines height, but that gene appears in more than one form—the gene that produces a short plant is an allele of the gene that produces a tall plant. The behavior of alleles and how they influence inherited traits follow predictable patterns. Austrian monk Gregor Mendel first identified these patterns in the 1860s .In organisms that use sexual reproduction, offspring inherit one-half of their genes from each parent and then mix the two sets of genes together. This produces new combinations of genes, so that each individual is unique but still possesses the same genes as its parents. As a result, sexual reproduction ensures that the basic characteristics of a particular species remain largely the same for generations. However, mutations, or alterations in DNA, occur constantly. They create variations in the genes that are inherited. Some mutations may be neutral, or silent, and do not affect the function of a protein. Occasionally a mutation may benefit or harm an organism and over the course of evolutionary time, these mutations serve the crucial role of providing organisms with previously nonexistent proteins. In this way, mutations are a driving force behind genetic diversity and the rise of new or more competitive species that are better able to adapt to changes, such as climate
Geneticists are scientists who study the function and behavior of genes. Since the 1970s geneticists have devised techniques, cumulatively known as genetic engineering, to alter or manipulate the DNA structure within genes. These techniques enable scientists to introduce one or more genes from one organism into a second organism. The second organism incorporates the new DNA into its own genetic material, thereby altering its own genetic characteristics by changing the types of proteins it can produce. In humans these techniques form the basis of gene therapy, a group of experimental procedures in which scientists try to substitute one or more healthy genes for defective ones in order to eliminate symptoms of disease.
Genetic engineering techniques have also enabled scientists to determine the chromosomal location and DNA structure of all the genes found within a variety of organisms. Scientists hope to use this genetic information to develop life-saving drugs for a variety of diseases, to improve agricultural crop yields.
Geneticists are scientists who study the function and behavior of genes. Since the 1970s geneticists have devised techniques, cumulatively known as genetic engineering, to alter or manipulate the DNA structure within genes. These techniques enable scientists to introduce one or more genes from one organism into a second organism. The second organism incorporates the new DNA into its own genetic material, thereby altering its own genetic characteristics by changing the types of proteins it can produce. In humans these techniques form the basis of gene therapy, a group of experimental procedures in which scientists try to substitute one or more healthy genes for defective ones in order to eliminate symptoms of disease.
Genetic engineering techniques have also enabled scientists to determine the chromosomal location and DNA structure of all the genes found within a variety of organisms. Scientists hope to use this genetic information to develop life-saving drugs for a variety of diseases, to improve agricultural crop yields.
