Importance Of Dna In Forensic Science

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DNA in forensic science The majority of cells making up the human body are diploid cells carrying identical DNA, with the exception of haploid gametes and red blood cells. Several types of biological evidence such as blood and hair are commonly used in forensic science, which is the scientific study of evidence for crime scene investigations and other legal matters. Forensic science is used for the purpose of DNA analysis, this is the analysis of DNA samples to determine if it came from a particular individual. DNA analysis is done by obtaining DNA samples from an individual; next, a large sample of DNA is produced from amplified selected sequences from the DNA collected. Finally, the amplified DNA regions are compare using a gel. DNA Profiling …show more content…

Population evolution can occur by genetic drift; this is a change in the gene pool of a small population due to change. Gene flow is also a cause of population evolution, this happens when a population loses or gains alleles by gene flow. Natural selection also causes population evolution, this promotes evolutionary adaption. The general outcomes of natural selection are directional selection, disruptive selection, and, stabilizing selection. Population evolution can also occur by sexual selection. Microbes were the first organism to occupy the Earth. They are a group of the smallest organisms and are single cellular organisms. Microbes are becoming important in areas such as biochemistry, genetics, agriculture and medicine. They are also important decomposers. One example, of a microbial life is the prokaryotes called bacteria. Bacteria that causes disease are called pathogens. The disease is caused by a poison called exotoxin and endotoxin produced by the bacteria. Another microbial life are protist. They are unicellular eukaryotes. Types of protist includes protozoans and slime molds. Fungi, is also an example of microbial life. They are unicellular or multicellular eukaryotes and are made up of a mass of threadlike hyphae forming mycelium. The cell wall are made from chitin. A mushroom is an example of …show more content…

Population size may vary as individuals are born or immigrate and other may die or emigrate. One model of population growth is the exponential Population Growth; which is the accelerating increase that occurs when growth is unlimited. It predicts that the larger the population is, the faster it grows. This growth model is normally for short lived organisms due to the introduction of a new or underexploited environment. Next, there is the Logistic Population Growth. This occurs when limiting factors slows down the growth rate. It predicts that when a population size is small or large, the growth rate will be small and that the population growth will be at its highest when it is at an intermediate level relative to the carrying capacity. Lastly, the regulation of Population Growth; which has to do with the limiting of population growth of a long term by a mixture of density-independent and density-dependent factors. Factors of density-dependent intensify as the population density increases. On the other hand, regardless the population size, density-independent factors affect the same percentage of

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