Medical Dictionary

alternation of generations n.
The regular alternation of forms or of mode of reproduction in the life cycle of an organism, such as between diploid and haploid phases, or between sexual and asexual reproductive cycles. Also called metagenesis, xenogenesis.

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