alternation

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Definition/MeaningWord/Phrase
no alternation of generations the medusoid phase being entirely suppressed: sea anemones; corals Actinozoa , Anthozoa , class Actinozoa , class Anthozoa
alternation of two or more different forms in the life cycle of a plant or animal alternation of generations , heterogenesis , xenogenesis
division of nonflowering plants characterized by rhizoids rather than true roots and having little or no organized vascular tissue and showing alternation of generations between gamete-bearing forms and spore-bearing forms; comprises true mosses (Bryopsid Bryophyta , division Bryophyta
coelenterates typically having alternation of generations; hydroid phase is usually colonial giving rise to the medusoid phase by budding: hydras and jellyfishes class Hydrozoa , Hydrozoa
alternation of sexual and asexual generations digenesis , metagenesis
gamete-bearing individual or phase in the life cycle of a plant having alternation of generations gametophyte
spore-producing individual or phase in the life cycle of a plant having alternation of generations sporophyte
(music) a tremulous effect produced by rapid repetition of a single tone or rapid alternation of two tones tremolo
mutability in life or nature (especially successive alternation from one condition to another) vicissitude
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