Sentences with phrase «asexual reproduction»

The researchers were forced to conclude that the pup had no father, making it the first documented case of asexual reproduction in cartilaginous fish.

Sexual reproduction leads to offspring that differ in small ways from their parents, but in asexual reproduction offspring are essentially clones and identical to their parents.

Fungi can reproduce sexually — and most of them do — but a minority opts for asexual reproduction because of the method's increased efficiency.

The researchers believe this restriction of genetic diversity could be detrimental to the survival of endangered shark species if female hammerhead sharks switch to asexual reproduction when they are having trouble finding a mate.

In contrast, bacteria reproduce by asexual reproduction — this is more efficient than sexual reproduction since each individual can reproduce when it's ready, simply by dividing.

It eventually makes its way to the intestine, where it lives as a trophozoite, and undergoes asexual reproduction.

But how do they — and the other 70 species of vertebrates that propagate this way — do it without the genetic monotony and disease vulnerability that often results from asexual reproduction?

«That was a big mystery because if there are two identical genomes coming together, the end product should be the same as if the fungi had just cloned itself through asexual reproduction,» said Heitman.

Sexual and asexual reproduction Meiosis DNA and the genome Genetic inheritance and disorders Sex determination Variation Genetic engineering Resistant bacteria Classification of living organisms

Why is sex so popular among plants and animals, and why isn't asexual reproduction, or cloning, a more common reproductive strategy?

While getting mammals to undergo true asexual reproduction has thus far been beyond the power of science, researchers are trying to figure out why the union of sperm and egg is so important in mammalian reproduction, when all other domains of life have the ability to reproduce without sex.

Some species of sea star (known commonly but erroneously as «starfish») use asexual reproduction via fragmentation as their main reproductive mode.

This isn't really asexual reproduction, as the offspring has DNA from two parents, but it is interesting and strange nonetheless.

The researchers believe the hammerhead shark reproduced by a type of asexual reproduction called automictic parthenogenesis, whereby an unfertilised egg is activated to behave as a normal fertilised egg by a small, nearly genetically identical cell known as the sister polar body.

Still, the insemination theory was considered «because it was even more difficult to imagine asexual reproduction in a shark,» says Paulo Prodöhl of Queen's University Belfast in Northern Ireland.

There would need to be some strong ongoing selective force for sex to be favoured over asexual reproduction.»

Asexual reproduction leads to clones.

Under stressful conditions yeast cells forgo asexual reproduction and split into four spores, each containing half the chromosomes of a typical cell, like human eggs and sperm.

Although asexual reproduction might seem like a bore — and one that can have questionable genetic outcomes unless done right — it has its benefits, too, Baumann notes.

No, but I do anticipate a form of robot asexual reproduction that carries over some of the characteristics of the robot's human owner / partner.

Scientists are not sure, since asexual reproduction is a better evolutionary strategy in some important ways.

Scientists theorize that asexual reproduction rarely confers new adaptations.

Apparently inspired by an article he read on asexual reproduction amongst Komodo dragons, Sawers dreamt up a clever premise resting just on the periphery of science fiction, conjuring an alternate history where women begin to reproduce agamically, and men, no longer biologically needed are obsolete and edge towards extinction — well, except for a significant but doting assemblage in Australia.

Often departing from anthropological approaches to seemingly incommensurate aspects of the world, such as asexual reproduction, the pharmaceutical industry, quantum particle behavior and highly regenerative life forms, Meres» work invites us to reconsider the patterns of difference that we weave to make sense of the objects, bodies, and behaviors around us.

Wild yeast can sexually reproduce during times of starvation or stress, but today's beer yeasts have lost this ability — they only have functional genes for asexual reproduction, likely due to their cushier living conditions.

For yeast, sexual reproduction is better than asexual reproduction when it comes to rapidly adapting to unfavourable environments

Many types of phytoplankton do increase their numbers rapidly but they propagate primarily by asexual reproduction, which makes it less likely for populations to accumulate the genetic mutations that could allow them to adapt.

(At Mote and other facilities, fragmenting coral is a form of asexual reproduction — cloning).

A single colony's polyps are typically all clones resulting from asexual reproduction and on their own offer the colony scant genetic versatility.

When they die, they sink quickly and, because they often form long chains (by budding off through asexual reproduction), take large amounts of carbon with them.

To test this hypothesis, he and his colleagues, former fellow Min Ni and current graduate student Marianna Feretzaki, grew the microbe in two different ways — one where it underwent asexual reproduction, the other where it underwent unisexual reproduction.

If God is the Creator and He is almighty, is it logically impossible for him to have introduced some sort of mechanism that would generate genetic mutation even in asexual reproduction?

To explain Holloway's point, it can be noted that asexual reproduction, such as in an amoeba, does not require the cooperation of two individuals.

Most GCSE biology students will recall that mitosis is the type of cell division used for growth, repair and asexual reproduction, producing cells identical to the parent cell, whereas meiosis is the cell division used in sexual reproduction, containing genetic material from both mother and father cells and giving rise to genetic variation.

The term «cloning» means the asexual reproduction of identical copies of an original, and it is human cloning (and to a lesser extent animal cloning) for reproductive purposes that causes considerable public disquiet.

The type of asexual reproduction may be part of an extreme survival strategy for sharks.

«Over time, if that continues and increases the incidence of asexual reproduction, then that might worsen the decline of the sharks.»

Researchers recently tested a theory developed in the 1970s by John Maynard Smith suggesting that sex is a more costly reproductive strategy than asexual reproduction.

Published in the Journal of Evolutionary Biology, researcher Dr Jack da Silva and student James Galbraith set out to answer the age - old puzzle that has been occupying evolutionary geneticists for 100 years or more of why most complex organisms reproduce sexually when asexual reproduction is much more efficient.

But asexual reproduction is far more efficient.

«Asexual reproduction, such as laying unfertilised eggs or budding off a piece of yourself, is a much simpler way of reproducing,» says Dr da Silva, Senior Lecturer in the University of Adelaide's School of Biological Sciences.

Asexual reproduction by females is terribly rare, and the team doesn't know how long ago this species evolved their peculiar behavior.

Your look at parthenogenesis, a form of asexual reproduction, speculates that genetics were the cause of high mortality rates in...

Unlike the offspring of asexual reproduction, the fertilized cells have hard cell walls that allow them to lie dormant on the bottom of ponds as they dry out for the summer.

A research team from Uppsala University has sequenced the entire genomes of a sample of Cape bees and compared them with other populations of honeybees to find out the genetic mechanisms behind their asexual reproduction.

The asexual reproduction of the bacteria meant the mutation rate likely also differed from the birds.

Becks hopes to test other organisms that have a capacity for both sexual and asexual reproduction to see if environmental cues could also spur more sex — in hopes of getting to the bottom of how these chancy encounters evolved in the first place.

Asexual reproduction is efficient and reliable in many small organisms, so why will some suddenly decide to mate?