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Chapter 24 - From Races to SpeciesEvolution is “genetic changes in populations of organisms through time that lead to differences among them.” Evolution does not necessarily produce new species but it does lead to recognizable differences that could justify classification of varieties or races of organisms. There are many potential isolating mechanisms that could enlarge the differences between races or varieties into species. If or when that happens within a lineage, a consequence of evolution has become speciation. These exercises review species and cases of speciation, modes of speciation, and then offer three views on a perhaps very realistic manner in which simple genetic changes could start toward reproductive isolation of segments of populations. This manner could be through changes in the chemistry of the chemical signals that bring insects together for mating.
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