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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.
Q. What is yellow fever? The Yellow fever is a viral infection that occurs mainly in Central Africa and in the Amazon region of South America. It is prevented by vaccination an
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When an individual is exposed to foreign serum antigen then a combination of symptoms are produced which is known as serum sickness.
PROVIDE a specific example for epithelial and connective tissues, how the arrangement of cells helps with tissue functioning?
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