What does metagenesis mean?

Definitions for metagenesis
ˌmɛt əˈdʒɛn ə sɪsmeta·ge·n·e·sis

This dictionary definitions page includes all the possible meanings, example usage and translations of the word metagenesis.

Princeton's WordNet

  1. metagenesis, digenesisnoun

    alternation of sexual and asexual generations

Wiktionary

  1. metagenesisnoun

    the production of sexual and asexual organisms in alternate generations

Wikipedia

  1. metagenesis

    Alternation of generations (also known as metagenesis or heterogenesis) is the predominant type of life cycle in plants and algae. It consists of a multicellular haploid sexual phase, the gametophyte, which has a single set of chromosomes alternating with a multicellular diploid asexual phase, the sporophyte which has two sets of chromosomes. A mature sporophyte produces haploid spores by meiosis, a process which reduces the number of chromosomes to half, from two sets to one. The resulting haploid spores germinate and grow into multicellular haploid gametophytes. At maturity, a gametophyte produces gametes by mitosis, the normal process of cell division in eukaryotes, which maintains the original number of chromosomes. Two haploid gametes (originating from different organisms of the same species or from the same organism) fuse to produce a diploid zygote, which divides repeatedly by mitosis, developing into a multicellular diploid sporophyte. This cycle, from gametophyte to sporophyte (or equally from sporophyte to gametophyte), is the way in which all land plants and most algae undergo sexual reproduction. The relationship between the sporophyte and gametophyte phases varies among different groups of plants. In the majority of algae, the sporophyte and gametophyte are separate independent organisms, which may or may not have a similar appearance. In liverworts, mosses and hornworts, the sporophyte is less well developed than the gametophyte and is largely dependent on it. Although moss and hornwort sporophytes can photosynthesise, they require additional photosynthate from the gametophyte to sustain growth and spore development and depend on it for supply of water, mineral nutrients and nitrogen. By contrast, in all modern vascular plants the gametophyte is less well developed than the sporophyte, although their Devonian ancestors had gametophytes and sporophytes of approximately equivalent complexity. In ferns the gametophyte is a small flattened autotrophic prothallus on which the young sporophyte is briefly dependent for its nutrition. In flowering plants, the reduction of the gametophyte is much more extreme; it consists of just a few cells which grow entirely inside the sporophyte. Animals develop differently. They directly produce haploid gametes. No haploid spores capable of dividing are produced, so generally there is no multicellular haploid phase. (Some insects have a sex-determining system whereby haploid males are produced from unfertilized eggs; however females produced from fertilized eggs are diploid.) Life cycles of plants and algae with alternating haploid and diploid multicellular stages are referred to as diplohaplontic (the equivalent terms haplodiplontic, diplobiontic and dibiontic are also in use, as is describing such an organism as having a diphasic ontogeny). Life cycles, such as those of animals, in which there is only a diploid multicellular stage are referred to as diplontic. Life cycles in which there is only a haploid multicellular stage are referred to as haplontic.

ChatGPT

  1. metagenesis

    Metagenesis is the biological phenomenon of alternating generation or cyclical changes in the mode of reproduction, typically involving both sexual and asexual reproduction methods. It is common in various species such as plants, fungi, and other organisms, where two or more different types of generations alternate. One generation reproduces sexually, while the other reproduces asexually. This alternation between sexual and asexual reproduction stages is pivotal for genetic diversity and adaptability within species.

Webster Dictionary

  1. Metagenesisnoun

    the change of form which one animal species undergoes in a series of successively produced individuals, extending from the one developed from the ovum to the final perfected individual. Hence, metagenesis involves the production of sexual individuals by nonsexual means, either directly or through intervening sexless generations. Opposed to monogenesis. See Alternate generation, under Generation

  2. Metagenesisnoun

    alternation of sexual and asexual or gemmiparous generations; -- in distinction from heterogamy

  3. Etymology: [Pref. meta- + genesis.]

Chambers 20th Century Dictionary

  1. Metagenesis

    met-a-jen′e-sis, n. (biol.) a kind of alteration of generations in which a series of generations of unlike forms come between the egg and the parent type.—adj. Metagenet′ic.

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Numerology

  1. Chaldean Numerology

    The numerical value of metagenesis in Chaldean Numerology is: 3

  2. Pythagorean Numerology

    The numerical value of metagenesis in Pythagorean Numerology is: 9

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"metagenesis." Definitions.net. STANDS4 LLC, 2024. Web. 18 May 2024. <https://www.definitions.net/definition/metagenesis>.

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