BIOL 142 Chapter 5-6: BIOL142_Notes-5-6
9 Jul 2018
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Factors that influence rate of mutations in population: population size, reproductive capacity, selection advantage. Macroevolution changes the gene pool of a population. Some changes can result in major changes in appearance. 1)start with isolation of portion of population: may undergo microevolutionary changes. Biological species reproductively isolated populations; closed gene pools. Alternative species definition biological species conceptt doesn"t apply when: asexual species, ring speicies, extinct species. Morphospecies concept uses differences in morphological characters (size, shape, and structure) to distinguish species exceptions: sexual dimorphism, similar looking species. Ecological species concept looking at ecological niches--role species plays in the environment. Evolutionary species concept single lineage of ancestor-descendant populations of organisms which maintains its identity from other such lineages. Allopatric speciation looking at species that have different fatherlands. Polyploidy tends to happen in plants; offspring end up with chromosomes more than the diploid #
