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Alternation of generations

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Alternation of generations
Alternation of generations (also known as metagenesis) is a term primarily used to describe the life cycle of plants (taken here to mean the Archaeplastida). A multicellular gametophyte, which is  haploid with n chromosomes, alternates with a multicellular sporophyte, which is  diploid with 2n chromosomes, made up of n pairs. A mature sporophyte produces spores by meiosis, a process which reduces the number of chromosomes to half, from 2n to n. Because meiosis is a key step in the alternation of generations, it is likely that meiosis has a fundamental adaptive function. The nature of this function is still unresolved (see Meiosis), but the two main ideas are that meiosis is adaptive because it facilitates repair of DNA damage and/or that it generates genetic variation.

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WordNet 2.0 Dictionary

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alternation of generations

Noun
1. the alternation of two or more different forms in the life cycle of a plant or animal
(synonym) heterogenesis, xenogenesis
(hypernym) organic phenomenon
(hyponym) metagenesis, digenesis


Common Terms in Evolutionary Biology and Genetics Dictionary

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Alternation of generations
An alternation of sexual (haploid) and asexual (diploid) form of generations in a life cycle (example: aphids). The relative dominance of each phase is variable in each organism (mosses have a dominant haploid phase whereas angiosperms have a dominant diploid phase). Besides aphids, Daphnia (water flea), rotifers, Hydra have alternation of generations in response to environmental conditions.

Dizionario inglese-italiano 1.0.012

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ALTERNATION OF GENERATIONS
ALTERNANZA DELLE GENERAZIONI. METAGENESI

Glosarium Pusat Bahasa Depdiknas Indonesia

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alternation of generations
B: (Biologi) pergiliran generasi

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