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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.
Asexual reproduction is the primary form of reproduction for single-celled organisms such as archaea and bacteria. Many plants and fungi sometimes reproduce asexually. While all prokaryotes reproduce without the formation and fusion of gametes, mechanisms for lateral gene transfer such as conjugation , transformation and transduction can be likened to sexual reproduction in the sense of genetic recombination in meiosis.
It is not entirely understood why the ability to reproduce sexually is so common among them. Current hypotheses  suggest that asexual reproduction may have short term benefits when rapid population growth is important or in stable environments, while sexual reproduction offers a net advantage by allowing more rapid generation of genetic diversity, allowing adaptation to changing environments. Developmental constraints  may underlie why few animals have relinquished sexual reproduction completely in their life-cycles.
Asexual and sexual reproduction
Sexual vs. Asexual Reproduction
Recognizability of sexual and asexual species of rotifers. Miller and Ayre ; Okinawa: If terminal fusion restitutional meiosis of anaphase II or the fusion of its products occurs, a little over half the mother's genetic material is present in the offspring and the offspring are mostly homozygous.
There was a problem with your submission. Atom, smallest unit into which matter can be divided without the release of electrically charged particles. Reproductive seasonality, settlement, and post-settlement mortality of Pocillopora damicornis Linnaeus , at Lizard Island, Great Barrier Reef.
In automictic parthenogenesis the offspring differ from one another and from their mother.
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Parthenogenesis , a reproductive strategy that involves development of a female rarely a male gamete copulation cell without fertilization. It occurs commonly among lower plants and invertebrate animals particularly rotifers Favour, aphids , ants , wasps , and bees and seldom among higher vertebrates.
An egg produced parthenogenetically may be either haploid i. Parthenogenic species may be obligate that is, incapable of sexual reproduction or facultative that is, capable of switching between parthenogenesis and sexual proliferation depending upon environmental conditions.
Big end frequently, parthenogenesis is the condition of a new individual from an unfertilized gamete. Often referred to as unisexual reproduction, it has been observed in not quite every major invertebrate group, with the exception of protochordates including hemichordates , and frequently occurs alternately with bisexual reproduction…. Gametes are reproductive cells that denouement from meiosis or reduction classification —in which a specialized room with a diploid double stipulate of chromosomes undergoes two fissions of its nucleus.
Meiosis gives rise to four gametes, or sex cells, which are haploid—in that each possesses half the number of chromosomes of the original cell see meiosis. Parthenogenesis can operate on either a haploid or a diploid apartment.
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Artemia parthenogenetica is a species or series of populations of parthenogenetic brine shrimps. These ants get both the benefits of both asexual and sexual reproduction   —the daughters who can reproduce the queens have all of the mother's genes, while the sterile workers whose physical strength and disease resistance are important are produced sexually.
Geographic differences in species boundaries among members of the Montastraea annularis complex based on molecular and morphological markers.
Reproductive allocation in plants. The offspring produced by apomictic parthenogenesis are full clones of their mother.
None of these studies detected any sign of sexual reproduction, even though population genetic surveys suggest frequent sexual recombination amidst predominantly asexual reproduction Ayre and Miller Richmond R, Jokiel P.
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Is his semen normal?Sexual and parthenogenetic reproduction are usually well separated by time Most reef-building corals reproduce sexually and asexually. .. [PubMed]; Chávez-Romo H, Reyes-Bonilla H. Reproducción sexual del coral. Asexual reproduction, including parthenogenesis in which embryos develop within a female without fertilization, is assumed to confer..