Asexual reproduction can be defined as the process by which offspring are produced from a single parent rather than through...
Asexual reproduction  is a type of reproduction by which offspring arise from a single organism, and inherit the genes of that parent only; it does not involve the fusion of gametes , and almost never changes the number of chromosomes.
- SPORES ARE AGENTS OF ASEXUAL REPRODUCTION, WHEREAS GAMETES ARE AGENTS OF SEXUAL REPRODUCTION....
- ASEXUAL REPRODUCTION IS A TYPE OF REPRODUCTION BY WHICH OFFSPRING ARISE...
See Principles of Biology. Some restrictions may apply to use of individual images which are separately licensed. Polyembryony is a widespread form of asexual reproduction in animals, whereby the fertilized egg or a later stage of embryonic development splits to form genetically identical clones.
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Sexual reproduction is a biological process by which organisms create descendants that have a combination of genetic material contributed from two different gametes reproductive or sex cells , usually from two different organisms. Others reproduce quickly; but, under normal circumstances, most offspring do not survive to adulthood.
Articles from Britannica Encyclopedias for elementary and high school students. Three important processes are involved in sexual reproduction: Unlike fission, this is not brought about by the separation of an existing organism into two partial entities. History of "Asexual reproduction" Note: In flowering plants, the term "apomixis" is now most often used for agamospermy, the formation of seeds without fertilization, but was once used to include vegetative reproduction.
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Asexual reproduction is a form of reproduction in which an being creates a genetically-similar or equivalent copy of itself without a contribution of genetic material from another individual. It does not involve meiosis , ploidy reduction, or fertilization, and only in unison parent is involved genetically. A more stringent definition is agamogenesis , which refers to production without the fusion of gametes.
Asexual reproduction is the brief form of reproduction for single-celled organisms such the archaea Equity, bacteria , and protists. Anyway, while all prokaryotes reproduce asexually without the formation and fusion of gametes , there conjointly exist mechanisms for lateral gene transfer, such as conjugation, transmogrification, and transduction, whereby genetic concrete is exchanged between organisms.
Biological processes involving lateral gene carry sometimes are likened to physical reproduction Narra and Ochman Many plants and fungi copy asexually as well, and asexual reproduction has been cited in some animals, including bdelloid rotifers , which only are known to reproduce asexually, and heterogeneous animals that exhibit parthenogenesis directed certain conditions. In parthenogenesis, such as found in some invertebrates and vertebrates , an embryo is produced without fertilization sooner than a male.
Generally, parthenogenesis is considered a form of asexual reproduction because it does not involve fusion of gametes of opposite sexes, nor any return of genetic material from two different sources Mayr however, some authorities McGraw-Hill classify parthenogenesis as sexual reproduction on the constituent that it involves gametes or does not produce an successor genetically identical to the fountain-head such as a female household turkey producing male offspring.
A wide spectrum of mechanisms may be exhibited. For example, sundry plants alternate between sexual and asexual reproduction see Alternation of generations , and the freshwater crustacean Daphnia reproduces by parthenogenesis in the spring to at the speed of light populate ponds, then switches to sexual reproduction as the forcefulness of competition and predation increases.
Many protists and fungi alternate between sexual and asexual proliferation.
However, because they rely on mutations for variations in their DNA , all members of the species have similar vulnerabilities. It is held that when environmental factors are favorable, asexual reproduction is employed to exploit suitable conditions for survival, such as an abundant food supply, adequate shelter, favorable climate, disease , optimum pH , or a proper mix of other lifestyle requirements.
Gymnosperms and angiosperms form two kinds of spores: When this macrocyst germinates, it releases hundreds of amoebic cells that are the product of meiotic recombination between the original two cells. The history of earlier contributions by wikipedians is accessible to researchers here:.
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