alternate generation


alternate generation
alternation of sexual with asexual generation, in which the products of one process differ from those of the other, a form of reproduction common both to animal and vegetable organisms. In the simplest form, the organism arising from sexual generation produces offspring unlike itself, agamogenetically. These, however, in time acquire reproductive organs, and from their impregnated germs the original parent form is reproduced. In more complicated cases, the first series of organisms produced agamogenetically may give rise to others by a like process, and these in turn to still other generations. Ultimately, however, a generation is formed which develops sexual organs, and the original form is reproduced

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  • Alternate generation — Alternate Al*ter nate (?; 277), a. [L. alternatus, p. p. of alternate, fr. alternus. See {Altern}, {Alter}.] 1. Being or succeeding by turns; one following the other in succession of time or place; by turns first one and then the other; hence,… …   The Collaborative International Dictionary of English

  • Alternate generation — Generation Gen er*a tion, n. [OE. generacioun, F. g[ e]n[ e]ration, fr.L. generatio.] 1. The act of generating or begetting; procreation, as of animals. [1913 Webster] 2. Origination by some process, mathematical, chemical, or vital; production;… …   The Collaborative International Dictionary of English

  • alternate generation — reproduction by alternate asexual and sexual means in an animal or plant species …   Medical dictionary

  • Alternate — Al*ter nate (?; 277), a. [L. alternatus, p. p. of alternate, fr. alternus. See {Altern}, {Alter}.] 1. Being or succeeding by turns; one following the other in succession of time or place; by turns first one and then the other; hence, reciprocal.… …   The Collaborative International Dictionary of English

  • Alternate alligation — Alternate Al*ter nate (?; 277), a. [L. alternatus, p. p. of alternate, fr. alternus. See {Altern}, {Alter}.] 1. Being or succeeding by turns; one following the other in succession of time or place; by turns first one and then the other; hence,… …   The Collaborative International Dictionary of English

  • Alternate angles — Alternate Al*ter nate (?; 277), a. [L. alternatus, p. p. of alternate, fr. alternus. See {Altern}, {Alter}.] 1. Being or succeeding by turns; one following the other in succession of time or place; by turns first one and then the other; hence,… …   The Collaborative International Dictionary of English

  • Generation — Gen er*a tion, n. [OE. generacioun, F. g[ e]n[ e]ration, fr.L. generatio.] 1. The act of generating or begetting; procreation, as of animals. [1913 Webster] 2. Origination by some process, mathematical, chemical, or vital; production; formation;… …   The Collaborative International Dictionary of English

  • Generation name — Chinese name Chinese 字辈 or 班次 Transcriptions Mandarin …   Wikipedia

  • Alternate versions of Iron Man — In addition to his mainstream incarnation, Iron Man has had been depicted in other fictional universes.Modern Continuity*Anthony Edward Tony Stark The first Iron Man, Tony Stark a wealthy industrialist and genius inventor creates the powered suit …   Wikipedia

  • Alternate versions of Robin — Robin is a fictional character, a superhero in publications from DC Comics. Robin has long been a fixture in the Batman comic books as Batman s sidekick. Since 1940, several different youths have appeared as Robin. In each incarnation, Robin s… …   Wikipedia