catagenesis

[kat-uh-jen-uh-sis]

cat·a·gen·e·sis

[kat-uh-jen-uh-sis]
noun Biology.
the retrogressive evolution of a species. Compare anagenesis (def. 1).

Origin:
1880–85; cata- + genesis

cat·a·ge·net·ic [kat-uh-juh-net-ik] , adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Catagenesis is always a great word to know.
So is gamete. Does it mean:
a mature sexual reproductive cell, such as a sperm or egg, that unites with another cell to form a new organism
the continuous sequence of changes undergone by an organism from one primary form, as a gamete, to the development of the same form again
American Heritage
Medical Dictionary

catagenesis cat·a·gen·e·sis (kāt'ə-jěn'ĭ-sĭs)
n.
See involution.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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