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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.
animals respiratory
Explain the Pathogens of forest insects? Caterpillars that defoliate forest trees have main economic impacts. Many such species go through periodic outbreaks. The forces which
Explain the Classification of Malignant Tumors Malignant tumors can be classified as: Carcinomas: These tumors arise from the epithelial lining (the squamous cells) e.g. ski
How many different molecules composed of (A) two (B) three, and (C) four amino acids, linked together by peptide bonds, can be made from the set of 20 naturally occurring amino aci
what is respiration of plants and its types
Non-nucleoside reverse transcriptase inhibitors (NNRTIs) - These drugs are direct, non-nucleoside inhibitors of HIV-1 reverse transcriptase. Combinations of an NNRTI with NRTIs
history of biology
What is eutrophication? Eutrophication is the process of excessive enhancing of nutrients, like phosphate and nitrate, in water because of direct deposit of non treated sewage.
Summer Stratification - Thermal stratification Thermal stratification is fairly pronounced during the summer seasons in most lakes of the temperate (cold) regions but is rare
Eutrophication - Effect on Water Bodies Moderate quantities of sewage decay naturally in a water body and water gets purified after some time. But the problem arises when the
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