ES101 Study Guide - Final Guide: Genuine Progress Indicator, Commensalism, Critical Role
8 Dec 2012
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Document Summary
Biological evolution took about 3. 7 billion years and this is when cells developed. Microevolution small genetic changes in a population. Macroevolution long-term evolutionary changes in a population. Gene pool a collection of genetic resources potentially available to the next generation. Genes that have two or more molecular forms are called alleles. Mutations random changes in dna molecules in a cell that can be inherited. Mutagens are mutations caused by external agents such as radioactivity or chemicals. Fundamental niche full potential range of physical, chemical, and biological conditions and resources a species could use. Generalists species are species that can have broad niches and capable of surviving in many areas. Specialist species have narrow niches and few habitats and few food choices, making them more prone to extinction. Allopatric speciation occurs in two phases, the first being geographic isolation which occurs when groups of the same population are physically isolated for long periods.
