anagenesis
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an·a·gen·e·sis
(ăn′ə-jĕn′ĭ-sĭs)n.
An evolutionary process that involves change from an ancestor species to a descendant species without the branching or splitting off of new taxa.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
anagenesis
(ˌænəˈdʒɛnɪsɪs)n
the progressive evolutionary changes that take place over time in a single genetic lineage
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014