Nurturing Life Sciences
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#Unit 2. Cellular Organization
A mutation that confers a more advantageous phenotype to an organism, relative to Individuals in the same population without the mutation, is positive selection of that organism.
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Mutations conferring antibiotic resistance in bacteria or venom-resistance of pray is example of positive selection of mutation in exons
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Positive selection in pray population leads to an “arm’s race” with predator (Host-pathogen same).
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Two genes may share some related exons but also have unique exons.
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A gene family is defined as a group of genes that encode related or identical products as a result of gene-duplication events.
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Genes that are more distantly related but that still can be recognized as having common ancestry. Such a group of gene families is called a superfamily.