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Mutations are the only kind of variability generating mechanism in prokaryotes and asexually reproducing organisms. But in eukaryotes where sexual recombination occurs, even in one generation there is a marked reshuffling of genes in the chromosomes which amplifies the genetic variability in a population. The kind of variability generated by recombination is tested by natural selection in as many genetic backgrounds as possible and in as short time as possible (say in one generation). Thus one of the greatest and fundamental advantages of sexual reproduction is the generation of variability. Provided the populations are large, even if mutations do not exist, the mechanism of sexual recombination alone would be generating new genotypes for very long time.
It has been shown by prospective studies that Rheumatic heart disease (RHD) is linked to the occurrence of carditis during the first episode of ARF. If the first episode is accompa
Benefit of the new brain imaging technology Benefit from the new brain imaging technology, notably the CT scan, and the application of high speed computer technologies, permitt
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To which heart chamber does the blood go after leaving the left atrium? What is the valve that separates these compartments? The arterial blood that has come from the lungs to
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Consequences of Aging It is hard to enumerate the general consequences of aging in different animals. Gradual loss of reproductive ability, neuromuscular coordination and not
Define Etiology and Clinical Features of Epilepsy? This disorder usually starts in childhood, with the peak incidence between birth and two years. Etiological factors include
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