alternation of generations

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Concise Oxford English Dictionary © 2008 Oxford University Press:
alternation of generations

▶noun Biology a pattern of reproduction shown by some lower plants and invertebrates, involving a regular alternation between sexual and asexual forms (as in ferns) or dioecious and parthenogenetic forms (as in some jellyfishes).

'alternation of generations' also found in these Oxford entries:

heterogamy - metagenesis

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alternation of generations