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Jump to: ,
Asexual reproduction in : a caducuous phylloid germinating

Asexual reproduction is reproduction which does not involve , reduction, or . Only one parent is involved in asexual reproduction. A more stringent definition is agamogenesis which refers to reproduction without the fusion of . Asexual reproduction is the primary form of reproduction for such as the , , and . Many and reproduce asexually as well. While all reproduce asexually (without the formation and fusion of gametes), mechanisms for such as , and are sometimes likened to .<ref name="Narra"></ref> A lack of sexual reproduction is relatively rare among multicellular organisms, for reasons that are not completely understood. Current hypotheses suggest that, while asexual reproduction may have short term benefits when rapid population growth is important or in stable environments, sexual reproduction offers a net advantage by allowing more rapid generation of genetic diversity, allowing adaptation to changing environments.

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Because asexual reproduction does not require the formation of (often in separate individuals) and bringing them together for , it occurs much faster than sexual reproduction and requires less energy. Asexual lineages can increase their numbers rapidly because all members can reproduce viable offspring. In sexual populations with two genders, some of the individuals are male and cannot themselves produce offspring. This means that an asexual lineage will have roughly double the rate of population growth under ideal conditions when compared with a sexual population half composed of males. This is known as . Other advantages include the ability to reproduce without a partner in situations where the population density is low (such as for some desert lizards), reducing the chance of finding a mate, or during colonisation of isolated habitats such as oceanic islands, where a single (female) member of the species is enough to start a population.

A consequence of asexual reproduction, which may have both benefits and costs, is that offspring are typically genetically similar to their parent, with as broad a range as that individual receives from one parent. The lack of results in fewer genetic alternatives than with sexual reproduction. Many forms of asexual reproduction, for example budding or fragmentation, produce an exact of the parent. This genetic similarity may be beneficial if the genotype is well-suited to a stable environment, but disadvantageous if the environment is changing. For example, if a new predator or appears and a is particularly defenseless against it, an asexual lineage is more likely to be completely wiped out by it. In contrast, a lineage that reproduces sexually has a higher probability of having more members survive due to the that produces a novel genotype in each individual.

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Many single-celled organisms (unicellular), such as , , and , reproduce asexually through . An exception to the rule are unicellular fungi such as , unicellular algae such as , and and some other , which reproduce both sexually and asexually. Some single-celled organisms (unicellular) rely on one or more organisms in order to reproduce, but most literally divide into two organisms.

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Some cells split via (for example ), resulting in a 'mother' and 'daughter' cell. The offspring organism is smaller than the parent. Budding is also known on a multicellular level; an animal example is the , which reproduces by budding. The buds grow into fully matured individuals which eventually break away from the parent organism.

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Vegetative reproduction is a type of asexual reproduction found in plants where new individuals are formed without the production of seeds or spores by or .<ref></ref> Examples of vegetative reproduction include the formation of miniaturized plants called plantlets on specialized leaves (for example in ), and some produce new plants out of or (for example in ). Other plants reproduce by forming or (for example bulbs and tubers). Some plants produce shoots and suckers that form along their lateral roots. Plants that reproduce vegetatively may form a , where all the individuals are clones, and the clones may cover a large area.<ref></ref>

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Many multicellular organisms form during their in a process called sporogenesis. Exceptions are animals and some protists, who undergo gametic meiosis immediately followed by fertilization. Plants and many algae on the other hand undergo sporic meiosis where meiosis leads to the formation of haploid spores rather than gametes. These spores grow into multicellular individuals (called in the case of plants) without a fertilization event. These haploid individuals give rise to through . Meiosis and gamete formation therefore occur in separate generations or "phases" of the life cycle, referred to as . Since sexual reproduction is often more narrowly defined as the fusion of gametes (), spore formation in plant and algae might be considered a form of asexual reproduction (agamogenesis) despite being the result of and undergoing a reduction in . However, both events (spore formation and fertilization) are necessary to complete sexual reproduction in the plant life cycle.

Fungi and some algae can also utilize true asexual formation, which involves giving rise to reproductive cells called mitospores that develop into a new organism after dispersal. This method of reproduction is found for example in and the Polysiphonia, and involves sporogenesis without meiosis. Thus the chromosome number of the spore cell is the same as that of the parent producing the spores. However, mitotic sporogenesis is an exception and most spores, such as those of plants, most , and many algae, are produced by .

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Fragmentation is a form of asexual reproduction where a new organism grows from a fragment of the parent. Each fragment develops into a mature, fully grown individual. Fragmentation is seen in many organisms such as animals (some annelid worms and sea stars), fungi, and plants. Some plants have specialized structures for reproduction via fragmentation, such as in . Most , which are a union of a fungus and algae or bacteria, reproduce through fragmentation to ensure that new individuals contain both symbionts. These fragments can take the form of soredia, dust-like particles consisting of fungal hyphae wrapped around photobiont cells.

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Parthenogenesis is a form of in which an unfertilized egg develops into a new individual. Parthenogenesis occurs naturally in many plants, (e.g. water fleas, aphids, , some ants, bees and parasitic wasps), and (e.g. some reptiles, amphibians, fish, very rarely birds). In plants, may or may not involve parthenogenesis.

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Agamogenesis is any form of reproduction that does not involve a male gamete. Examples are and .

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Apomixis in plants is the formation of a new without fertilization. It is important in ferns and in flowering plants, but is very rare in other seed plants. 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 . An example of an apomictic plant would be the European . Apomixis mainly occurs in two forms: In gametophytic apomixis, the embryo arises from an unfertilized egg within a diploid embryo sac that was formed without completing meiosis. In , the embryo is formed from the diploid tissue surrounding the embryo sac. Nucellar embryony occurs in some seeds. Male apomixis can occur in rare cases, such as the Saharan Cypress where the genetic material of the embryo are derived entirely from pollen. The term "apomixis" is also used for asexual reproduction in some animals, notably water-fleas, .

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Some species alternate between the sexual and asexual strategies, an ability known as , depending on conditions. For example, the freshwater crustacean reproduces by parthenogenesis in the spring to rapidly populate ponds, then switches to as the intensity of competition and predation increases. Many protists and fungi alternate between sexual and asexual reproduction. For example, the slime mold undergoes binary fission as single-celled amoebae under favorable conditions. However, when conditions turn unfavorable, the cells aggregate and switch to sexual reproduction leading to the formation of spores. The hyphae of the common mold () are capable of producing both mitotic as well as meiotic spores. Many algae similarly switch between sexual and asexual reproduction. Asexual reproduction is far less complicated than sexual reproduction. In sexual reproduction one must find a mate.

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A number of invertebrates and some less advanced vertebrates are known to alternate between sexual and asexual reproduction, or be exclusively asexual. Alternation is observed in a few types of insects, such as (which will, under favourable conditions, produce eggs that have not gone through meiosis, essentially cloning themselves) and the cape bee (which can reproduce asexually through a process called ). A few species of amphibians and reptiles have the same ability (see for concrete examples). A very unusual case among more advanced vertebrates is the female 's ability to produce fertile eggs in the absence of a male. The eggs result in often sickly, and nearly always male turkeys. This behaviour can interfere with the incubation of eggs in turkey farming.<ref>Savage, Thomas F. </ref>

There are examples of parthenogenesis in the <ref></ref> and the . <ref></ref> In both cases, the sharks had reached sexual maturity in captivity in the absence of males, and in both cases the offspring were shown to be genetically identical to the mothers.

Bdelloid reproduce exclusively asexually, and all individuals in the class are females. Asexuality evolved in these animals millions of years ago and has persisted since. There is evidence to suggest that asexual reproduction has allowed the animals to evolve new proteins through the that have allowed them to survive better in periods of dehydration.<ref></ref>

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<references/>

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  • Graham, L., J. Graham, & L. Wilcox. 2003. Plant Biology. Pearson Education, Inc., Upper Saddle River, N.J.: pp. 258-259.
  • Raven, P.H., Evert, R.F., Eichhorn, S.E. 2005. Biology of Plants, 7th Edition. W.H. Freeman and Company Publishers, NY.

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