Campbell Biology (11th Edition)

Published by Pearson
ISBN 10: 0-13409-341-0
ISBN 13: 978-0-13409-341-3

Chapter 23 - 23.3 - Concept Check - Page 495: 2


Genetic drift involves random chance alterations of allelic frequencies in small populations, usually greatly reducing or eliminating one or more alleles. In contrast, gene flow involves individuals moving into a population, whatever its size, usually increasing genetic variation (though lots and lots of one homozygous genotype flowing into a population could reduce variation).

Work Step by Step

Review the definitions in the text and use your imagination to see that genetic drift usually makes a population more homogeneous, while gene flow would usually bring more (and, perhaps, novel) alleles into the population.
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