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Genes, Cognition, and Communication
Genes, Cognition, and Communication

... has proved difficult for researchers to identify genes that would explain substantial amounts of variance in cognitive traits or disorders. Although this observation may seem paradoxical, it fits with a multifactorial model of how complex human traits are influenced by numerous genes that interact w ...
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Chapter 9 - Personal

... Populations of dogs became isolated from each other Humans chose dogs with specific traits for breeding Each breed has physical and behavioral traits due to a unique genetic ...
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File

... The allele for red flower colour (R) in a certain plant is co-dominant with the allele for white flowers (R’). Thus a plant with the genotype RR’ has pink flowers. Tall (D) is dominant to dwarf (d). What would be the expected phenotypic ratio from a cross of RR’dd plants with R’R’Dd plants? ...
chapter 2: genetic inheritance
chapter 2: genetic inheritance

... 1. The pea plant was an excellent choice for Mendel’s experiments because A. the plant can self-fertilize. B. true-breeding varieties were available. C. true-breeding varieties were available and it can be cross-fertilized. D. true-breeding varieties were available, the plant can self-fertilize and ...
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... complex organisms, differentiation and specialization during development, and the chemical reactions necessary to sustain life. Students describe the functions of cell structures. Students use the theory of evolution to explain diversity of life. Goal 3.1: Understand the Theory of Biological Evoluti ...
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Evolution of hominoids and the search for a genetic basis for

... (orangutan and gibbon), using the immunodiffusion method. However, his results remain semiquantitative. The later application of the microcomplement fixation method of Sarich and Wilson (1967) greatly enhanced the sensitivity of the immunological reaction, and allowed the estimation of the divergen ...
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73KB - NZQA

... disease but other alleles / DNA / genes result in a plant that is affected by a disease. Sexual reproduction has the following processes that all contribute to variation in the offspring: meiosis / mutations / fertilisation / crossing over / independent assortment/ segregation Sexual reproduction re ...
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Lecture 32 POWERPOINT here

... or such an organism is called a homozygote. • Heterozygous - a gene or trait if it has different alleles at the gene's locus for each homologous chromosome. Such an organism must be either diploid, have two homologous chromosomes in each cell, or polyploid, having more than two homologous chromosome ...
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Jewish Genetic Sensitivity To Pollution Accentuated Disease

... We all know that the human body has developed defense mechanisms against disease over eons of evolution. It is also quite understandable tha t variations in these mechanisms exist between individuals (as functions of one’s general health, parentage, etc.). But what is becoming increasingly known, wi ...
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Human genetic variation



Human genetic variation is the genetic differences both within and among populations. There may be multiple variants of any given gene in the human population (genes), leading to polymorphism. Many genes are not polymorphic, meaning that only a single allele is present in the population: the gene is then said to be fixed. On average, in terms of DNA sequence all humans are 99.9% similar to any other humans.No two humans are genetically identical. Even monozygotic twins, who develop from one zygote, have infrequent genetic differences due to mutations occurring during development and gene copy-number variation. Differences between individuals, even closely related individuals, are the key to techniques such as genetic fingerprinting. Alleles occur at different frequencies in different human populations, with populations that are more geographically and ancestrally remote tending to differ more.Causes of differences between individuals include the exchange of genes during meiosis and various mutational events. There are at least two reasons why genetic variation exists between populations. Natural selection may confer an adaptive advantage to individuals in a specific environment if an allele provides a competitive advantage. Alleles under selection are likely to occur only in those geographic regions where they confer an advantage. The second main cause of genetic variation is due to the high degree of neutrality of most mutations. Most mutations do not appear to have any selective effect one way or the other on the organism. The main cause is genetic drift, this is the effect of random changes in the gene pool. In humans, founder effect and past small population size (increasing the likelihood of genetic drift) may have had an important influence in neutral differences between populations. The theory that humans recently migrated out of Africa supports this.The study of human genetic variation has both evolutionary significance and medical applications. It can help scientists understand ancient human population migrations as well as how different human groups are biologically related to one another. For medicine, study of human genetic variation may be important because some disease-causing alleles occur more often in people from specific geographic regions. New findings show that each human has on average 60 new mutations compared to their parents.Apart from mutations, many genes that may have aided humans in ancient times plague humans today. For example, it is suspected that genes that allow humans to more efficiently process food are those that make people susceptible to obesity and diabetes today.
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