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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.
What is Congenital Mitral Stenosis ? The onset of symptoms or signs depends on severity of the stenosis, severe the stenosis earlier the presentation. With significant MS, the
Define Equilibrium Conditions in Multicomponent Systems? This chapter applies equilibrium theory to a variety of chemical systems of more than one component. Two different appr
Chronic Pulmonary Thromboembolism : The operation recommended is pulmonary thrombo endarterectomy. Indication : The main indication for surgery is when patients with chroni
The biologicaI species concept claims that species consist of natural populations and that species are real and objective. They are not man-made subjective abstraction. According
Explain the Superficial Minor Burns? Superficial minor bums are immersed immediately in cool water if possible. The burn is carefully cleaned to prevent infection. If dirt is d
lest the characteristics of Protozoa
Q. Show technical aspects of the postero-anterior film? 1) Identification: Patient identification and side marker must be present. 2) Centering: The thoracic spinous pro
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What is Vacuoles A very conspicuous feature in most plant cells is the presence of one or more large vesicles called vacuoles which are separated from the rest of the cytoplasm
Sheep-pox Sheep-pox, a highly contagious disease, causes a mortality of 20 to 50% in animals below the age of 6 months. It also causes damage to the wool and skin in adults. Of
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