156 Evolution
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Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.Evolution
Section 15.3 Shaping Evolutionary Theory
Scan Section 3 of the chapter. Write two facts that you discover.1.2.
Use your book or dictionar y to define allele.Write the correct vocabular y term in the left column for each
definition below.allele frequencies remain the same unless acted upon by a factorrandom evolution that occurs in a small, separate subpopulationprocess of a large population declining in number then rebounding
to a large number againmechanism that operates before fertilization occurschange in the allele frequencies in a population by chanceselection which removes organisms with extreme
expressions of a traitmechanism that operates after fertilization occurs to ensure that
resulting hybrid remains infertileselection which shifts a population toward an extreme traitselection which removes individuals with average traitschange in a trait based on competition for matesspeciation in the presence of a barrierspeciation without any barriersalleleReview
VocabularyNew
Vocabulary