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apter 15 questions Help Save Complete each of the following statements describing ways in which microevolution, or evolution within a species, occurs 8 Natural selection occurs when random events cause changes in the genetic composition of a population Small populations are more likely than large populations to experience evolutionary change based on random events which is the tendency of populations to adapt to their environment to enhance survival, was first proposed by Migration involves either individuals or gametes moving from one population or another, thereby causing gent flow Mutations, or DNA sequence changes, are the basis for all genetic variability among and within species Chades Darwin Migration Mutations genetic variability eine flow Genetic dritt less Natural selection Gregor Mendel more