the gene pool) * Populations evolve through changes in their gene pools‚ meaning that population genetics is essentially a study of evolution * There are 4 major evolutionary forces: 1. Mutation 2. Migration 3. Inbreeding/genetic drift 4. Selection * Describing population
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matings between different pea plants. c. it is possible to obtain large numbers of progeny from any given cross. d. peas have an unusually long generation time. e. many of the observable characters that vary in pea plants are controlled by single genes. 2. A plant with purple flowers is allowed to self-pollinate. Generation after generation‚ it produces purple flowers. This is an example of a. hybridization. b. incomplete dominance. c. true-breeding. d. the law of segregation. e. polygenetics. 3
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1. Alleles are different versions of the same gene and one may be dominant to the other. –TRUE 2. In a dihybrid cross of a mother and father who are both heterozygous dominant for chin fissures and dimples‚ what would be the phenotypic ratio of chin fissures and dimples in their offspring? –-9:3:3:1 3. If two alleles are heterozygous‚ it means they are the same allele. --FALSE 4. If the letter ""C"" stands for the dominant allele for having a chin fissue and the letter ""c"" stands for the recessive
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Biology is defined as “the study of life” from the Greek‚ bios meaning ‘life’ and logos meaning ‘study’. This approach has one key assumption. Our behaviours and the way we experience things are due to our biology. Genes‚ chemicals such as hormones‚ brain structure and systems. They believe that the environment does not have any influence on your condition. This approach tends to fit in with the nature nurture debate. A biological perspective is relevant to the study of psychology in three ways:
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Bloom syndrome is a rare genetic disorder. Usually due to this disease a skin rash may occur after exposure to the sun‚ and chance of cancer is largely increased. A New York dermatologist named David Bloom discovered the syndrome‚ hence the name‚ in 1954. Since the discovery‚ there have been more than 170 case reports for this disorder just in the United States. There are a variety of symptoms for this disorder. Usually the first physical symptom of bloom syndrome is growth delay. Over 50% of children
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Techniques There are a number of techniques for moving genes artificially into recipient organisms. The oldest of these is called recombinant DNA‚ a technique that relies on biological vectors like plasmids or viruses. Other newer gene transfer techniques are electro- and chemical poration‚ microinjection‚ and bioballistics. Recombinant DNA Recombinant DNA techniques use biological vectors like plasmids and viruses to carry foreign genes into cells. Plasmids are small circular pieces of genetic
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“n” no fur 3 Petri dishes III. Methods: i. Obtain a gene pool containing 50 normal genes (N) and 50 defective genes (n). ii. Record and calculate the initial frequencies on the data chart. Write a hypothesis above the data table that predicts what will happen to the frequency of the defective gene over four generations. iii. Label one Petri dish “N” and one “n”. Label the third dish “graveyard”. iv. Shake the bag containing all the genes in order to “mate” the yaks in the population. v. Blindly
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presented in the next generation. Another mechanism of evolution is genetic drift. Genetic drift is a random change in a small gene pool due to sampling errors in propagation of alleles or chance. Genetic drift depends greatly on the size of the gene pool. If the gene pool is large‚ the better it will represent the gene pool of the previous generation. If it is small‚ its gene pool may not be accurately represented in the next generation due to sampling error. Genetic drift usually occurs in small populations
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Professor Kevin M. Beaver and Joseph A. Schwartz believe‚ “that a warrior gene has been demonstrated to be related to aggressive and violent behavior. In fact‚ humans with a low-activity form of the MAOA gene are much more prevalent in populations with a history of warfare. These individuals are also more likely to join gangs and to use weapons in committing crimes than other persons” (Hickey 48). Beaver and Schwartz believe that the theories proposed over the past half-century have focused entirely
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luxA and luxB genes lie within this sequence: * luxA cds 4230-5294 * (5294-4230)+1 = 1065 nt long * (1064+1)/3 = 355 AA long protein expected * luxB cds 5333-6313 * (6313-5333)+1 = 981 nt long * (980+1)/3 = 327 AA long protein expected * lux A RBS: luxA rbs 4217-4222 (aaag ga) * Each gene within the lux operon must have its own RBS because the polypeptide synthesis from the lux operon transcript is an independent process where each gene within the lux
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