According to the British "Times" reported that new study found that a micro-called bdelloid rotifers in a billion years of biological, has been through asexual reproduction, the fact that the overthrow of the animals a strong need to create a mating theory of biodiversity. Researchers bdelloid rotifers to analyze the shape of E, and compare with the genetic data, found that under the pressure of natural _select_ion in animals formed their own diversity. They said their study "the overthrow of the sexual reproduction is a necessary condition for the biodiversity point of view." The length of not more than four times the length of human sperm small animals all female, but they have evolved with different heterogeneous ecological niche. The researchers found that the two parasites in the water body lice subspecies of bdelloid rotifers. The research, there is a parasitic louse's legs in the water around a water lice like to stay in the chest. After genetic analysis showed that these two biological distinct, the observed data show that bdelloid rotifers both the shape of their jaw very different. Generally believed that asexual reproduction by animals or plants in the evolutionary process will soon be extinct, but diversity of bdelloid rotifers to create the capacity may explain why they will long endure. One is amber sealed specimens showed that animals living in at least 4 million years ago, dna studies have shown that they lived about 100 million years ago. Previously considered asexual animals and plants evolve through mutation of the way, but the cost must be the original form, can only mutate into a species. Proved to bdelloid rotifers can evolve into many different forms.
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Introduction
One kind of asexual reproduction of freshwater invertebrates, the body length of about 0.1 to 1 mm. Bdelloid rotifers in about 4000 years ahead of the asexual reproduction stage, all laid eggs female offspring. Hardy surprising, at any stage of life, can survive in the water environment for several years without complete dehydration, after the return to the water will recover. In addition, it also radiation. Bdelloid rotifers that overthrew the animals need to mate to create the theory of biological diversity.
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Previous studies
Researchers bdelloid rotifers to analyze the shape of E, and compare with the genetic data, found that under the pressure of natural _select_ion in animals formed their own diversity. They said their study "the overthrow of the sexual reproduction is a necessary condition for the biodiversity point of view." The length of not more than four times the length of human sperm small animals all female, but they have evolved with different heterogeneous ecological niche. The researchers found that the two parasites in the water body lice subspecies of bdelloid rotifers. The research, there is a parasitic louse's legs in the water around a water lice like to stay in the chest. After genetic analysis showed that these two biological distinct, the observed data show that bdelloid rotifers both the shape of their jaw very different. Generally believed that asexual reproduction by animals or plants in the evolutionary process will soon be extinct, but diversity of bdelloid rotifers to create the capacity may explain why they will long endure. One is amber sealed specimens showed that animals living in at least 4 million years ago, DNA research shows that they lived about 100 million years ago. Previously considered asexual animals and plants evolve through mutation of the way, but the cost must be the original form, can only mutate into a species. Proved to bdelloid rotifers can evolve into many different forms.
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Newly discovered
Bdelloid rotifers aquatic organisms has been adopted because of its nature, asexual reproduction has not been eliminated but the extinction caused by the attention of scientists. United States May 29, 2008, a new study shows that the secret of this organism is that it will "steal" other organisms useful genes into their genetic information used for their own and future generations. Scientists from the United States by Harvard University study found that the bdelloid rotifers not only can "steal" bacteria, fungal DNA, a DNA of plants and animals as long as it useful, it will not let go.
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Still evolving asexual reproduction
According to reports, the nature of the vast majority of organisms will evolve to adapt to environmental changes to the sexual reproduction phase, so that species can evolve new and useful genes or gene variant eliminated bad. In addition, almost all other types of multi-cellular animals have a strong foreign DNA to resist the system, but the bdelloid rotifers seem to "generosity." Therefore, the scientific community why do asexual bdelloid rotifers have evolved also been confused.
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Combined with other bio-genetic
To uncover the mystery of bdelloid rotifers, Harvard University, Al Irina and Matthew Meselson baby hippo and other researchers analyzed the genes it found that bdelloid rotifers can "steal "Other species genes, _select_ one useful to remove harmful mutation combined to form their own genes. Scientists believe that when the rotifers were forced to dehydration, they will break down the original genetic material, so that the cell membrane rupture, wait until they return to the water, they can reconstruct the genetic material and cell membranes, the other from nearby or other rotifers organisms where "stealing" part of the genetic material for their own use. The team in the "Science" published a paper, said: "In the body of bdelloid rotifers, we found that many of the original should belong to bacteria, fungi and even plants genes." A Erxi Simone de Beauvoir said in a statement: "This fascinating creatures not only easy 'through' obstacles combined with other objects genes and, more surprisingly, it can even make part of the foreign gene to maintain function. "
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Help cure human
Bdelloid rotifers was discovered in 1702. At that time the famous Dutch scientist Anthony Lu Hawk in the gutter outside the house to take to the soil and add water to observe the micro-organisms in water, so that the rotifers. At Harvard University, released the results of this study before, people have been able to achieve that only part of the bacterial gene transfer, but no single species of animals can be someone else's genes for their own use. Study of bdelloid rotifers broke the old concept of the scientific community. The researchers next will study the chromosomes of bdelloid rotifers whether it contains the homologous gene from other similar, also intends to test the rotifers in a vacuum where other people will use from the "stolen" the DNA fragments. Reported that, if we can figure out how to obtain and use the biological foreign gene, can help people develop new drugs because of cancer, heart disease and other diseases related to living tissue of the gene mutation.