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Metagenesis :: Metagenesis (n.) 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..

Regeneration :: Regeneration (n.) The reproduction of a part which has been removed or destroyed; re-formation; -- a process especially characteristic of a many of the lower animals; as, the regeneration of lost feelers, limbs, and claws by spiders and crabs..

Evolution :: Evolution (n.) That theory of generation which supposes the germ to preexist in the parent, and its parts to be developed, but not actually formed, by the procreative act; -- opposed to epigenesis..

Plasmid :: Plasmid (n.) A piece of DNA, usually circular, functioning as part of the genetic material of a cell, not integrated with the chromosome and replicating independently of the chromosome, but transferred, like the chromosome, to subsequent generations. In bacteria, plasmids often carry the genes for antibiotic resistance; they are exploited in genetic engineering as the vehicles for introduction of extraneous DNA into cells, to alter the genetic makeup of the cell. The cells thus altered may produ

Wallerian Degeneration :: Wallerian degeneration () A form of degeneration occurring in nerve fibers as a result of their division; -- so called from Dr. Waller, who published an account of it in 1850..

Anthropogeny :: Anthropogeny (n.) The science or study of human generation, or the origin and development of man..

Redia :: Redia (n.) A kind of larva, or nurse, which is prroduced within the sporocyst of certain trematodes by asexual generation. It in turn produces, in the same way, either another generation of rediae, or else cercariae within its own body. Called also proscolex, and nurse. See Illustration in Appendix..

Metagenesis :: Metagenesis (n.) Alternation of sexual and asexual or gemmiparous generations; -- in distinction from heterogamy.

Perigenesis :: Perigenesis (n.) A theory which explains inheritance by the transmission of the type of growth force possessed by one generation to another.

Archegony :: Archegony (n.) Spontaneous generation; abiogenesis.

Irregeneration :: Irregeneration (n.) An unregenerate state.

Colloid :: Colloid (n.) A gelatinous substance found in colloid degeneration and colloid cancer.

Weldon''s Process :: Weldon's process () A process for the recovery or regeneration of manganese dioxide in the manufacture of chlorine, by means of milk of lime and the oxygen of the air; -- so called after the inventor..

Sporozoa :: Sporosac (n.) An early or simple larval stage of trematode worms and some other invertebrates, which is capable or reproducing other germs by asexual generation; a nurse; a redia..

Descent :: Descent (n.) Derivation, as from an ancestor; procedure by generation; lineage; birth; extraction..

Regeneration :: Regeneration (n.) The entering into a new spiritual life; the act of becoming, or of being made, Christian; that change by which holy affectations and purposes are substituted for the opposite motives in the heart..

Oviparity :: Oviparity (n.) Generation by means of ova. See Generation.

Reproduce :: Reproduce (v. t.) To produce again, by generation or the like; to cause the existence of (something of the same class, kind, or nature as another thing); to generate or beget, as offspring; as, to reproduce a rose; some animals are reproduced by gemmation..

Seed :: Seed (n.) Race; generation; birth.

Heirloom :: Heirloom (n.) Any furniture, movable, or personal chattel, which by law or special custom descends to the heir along with the inheritance; any piece of personal property that has been in a family for several generations..

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