asexual

Same-Sex Mating Discovered in a Toxic Fungus

...e unisexual fruiting occurred strictly through the asexual division of cells into identical clones, Heitman s..., the researchers found that, rather than being an asexual process, the hallmarks of mating occur during fruiting of alpha isolates. Unisexual fruiting involve...

Mosquitoes are more attracted to individuals infected with malaria

...e malaria, one infected with the non-transmissible asexual stage of the disease, and one with no infection. A device called an olfactometer wafted the odours of each participant towards the mosquitoes. Researchers measured which child most attracted the hungry bugs. Koella et al. found that individuals attra...

MBL researchers probe how an ancient microbe thrives and evolves without sex

...' DNA that has enabled them to succeed where other asexual species have failed. In a paper published in this...handle DNA transposons more efficiently than other asexual species. Transposons are small snippets of "junk DNA" that sexual reproduction compensates for, but ...

Sex: It's costly but worth it. Just ask a microbe

...icrobes reproduce asexually, but they are actually asexual and sexual," says Xu. Using a fungus that has two ...ir fitness. "We noticed that mating stunted their asexual reproduction because each partner spent more time attracting the other than nourishing its own growt...

Malaria vaccine prompts victims' immune system to eliminate parasite from mosquitoes

...ction, these cells, for the most part, exist in an asexual form. Some of the Plasmodium cells, however, transform into gametocytes—the sexual forms of the parasite that are equivalent to sperm and eggs. Fertilization takes place in the mosquito gut, after which the parasite imbeds itself in the gut lini...

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Fact and friction: Putting election-year stem cell claims under the microscope

...what is called "therapeutic cloning," which is the asexual reproduction of stem cells to make other stem cells for research purposes. Green and others say therapeutic cloning is tantamount to cloning a human being if you believe an embryo is already a human being. Others say an embryo cannot become a human ...

asexual at Biology Definition

Reproduction

...apable of vegetative reproduction . Other ways of asexual reproduction are binary fission , fragmentation and spore formation . There are a wide range of reproductive strategies employed by different species. Some animals, like the human (sexually mature after adolescence ) and Northern Gannet (5-...

Red Queen

... First, if an advantageous mutation occurs in an asexual line, it is impossible for that mutation to spread without wiping out all other lines, which may have different advantageous mutations of their own. Second, it mixes up genes. Some genes might be advantageous only when paired with other genes, and ...

Prokaryote

...throughout the cell. Reproduction is exclusively asexual , through binary fission , where the chromosome is duplicated and attaches to the cell membrane, and then the cell divides in two. However, they show a variety of parasexual processes where DNA is transferred between cells, such as transformation ...

Parthenogenesis

...ons are typically all-female.As with all types of asexual reproduction , there are both costs and benefits a...understood. Current hypotheses suggest that, while asexual reproduction may have short term benefits when rapid population growth is important or in stable env...

Natural selection

...n the process of reproduction: in the case of both asexual and sexual reproduction, random mutation (including DNA transcription errors); in the case of sexual reproduction (which mixes the DNA of two parents into an offspring), gene flow and genetic drift are also important mechanisms. Competition ...

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Vertebrates

...from external sources and reproduce sexual ly or asexual ly ... Full article >>> Two class es of intracellular lectins involved in glycoprotein trafficking are present in yeast, model in vertebrates and vertebrates , and two other class es are present in vertebrates only. Full art...

Variety

...ellular organelles that reproduce sexual ly or asexual ly, and also carry out photosynthesis ... Full article >>>...

Unicellular

...liquid or moist habitat s, primarily reproducing asexual ly by simple cell division or by budding of a ...ed tissue s and that primarily reproduce through asexual means, although conjugation does occur. Full article >>> Proponents say that genet...

Tracheae

...rangium (plural: sporangia). A structure in which asexual spore s are produced. Full article >>>...

Trachea

...rangium (plural: sporangia). A structure in which asexual spore s are produced. Full article >>> Spiracles : The external openings of the insect breathing ( trachea l) system, found along the abdomen . Full article >>> Cells lining the human upper respiratory tract are ...

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First Human Clone born

...ing of a new era in human reproduction - the first asexual birth, the first time a child was produced that was not the product of a genetic mix of mother and father, but the identical reproduction of one of its parents. In this case, Ms. Boisselier had told AFP on November 27 that the baby would be an ident...

Researchers Document First Case of Virgin Birth in Sharks

...ould be believed, but scientists could not imagine asexual reproduction among sharks. "Because it was even more difficult to imagine asexual reproduction in a shark," New Scientist quoted Paulo Prodohl of Queen's University Belfast in Northe...

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Whitehead

...Gutmann, a counselor at the University of Chicago, asexual couplings are increasingly common. Full article >>> common inflammatory disease of the hair follicles and sebaceous glands characterized by blackheads , whitehead s, pustules , nodules and, in the more severe forms, by cyst...

Erythrocyte

...62; Sporozoites enter erythrocyte s and undergo asexual reproduction (budding). In the blood , some parasites differentiate into male and female gametes although these cannot be distinguished at the light microscope level. Full article >>> Red blood cells ( Erythrocyte s) Cells in the ...

Alopecia

...rticularly uncomfortable, which, in turn, promotes asexual feelings. Full article >>> People with this condition repeatedly and incessantly pull out their hair , one strand at a time, from the roots. They most often pull hair from the scalp, eyelashes or eyebrows. Trichotillomania can le...