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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.
Kingdom Fungi Fungi was earlier placed with the true plants and are still largely considered so in the domain of botanists yet they are quite different. They are multicellular
Ganciclovir (Cytovene) IV ganciclovir is approved for both induction and maintenance treatment of cytomegalovirus (CMV) retinitis in immunocompromised patients and for prevent
Overturn - Thermal stratification The summer or winter stratification is seasonal. Circulation of lake water occurs twice a year, in the spring and autumn (fall) seasons by a
Prevention of perinatal transmission Zidovudine alone, started at 14-34 weeks of gestation and continued in the infant for the first 6 weeks of life, reduced HIV transmission
Explain the Concept of Menu Planning? You have learnt from the previous units that our body's many functions, be it physical activity, mental exercise, growth (in the case of c
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Q. Arthropod identity card. How are arthropods characterized according to examples of representing beings, basic morphology, type of symmetry, germ layers and coelom, digestive sys
Cation Saturation and Nutrient Absorption by Plants The availability of adsorbed cations is not always so easy as the above explanation might suggest. This is because, several
Define ascending type of paper chromatography? The ascending type consists in dipping the lower end of the paper containing the sample spots into the solvent so that it is abov
Head - check for size, shape or fontanelles, caput, or any other abnormality. Fontanel - anterior fontanel is diamond shaped having size of 2.5 - 4.5 cms. It close
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