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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 the difference between the concepts of food chain and food web? The chain theory is a theoretical model to study the energy flux in ecosystems. In fact, in an ecosystem
Potato type: Potato A: Beginning displacement (ml)= Ending displacement (ml) = Potato B: Beginning displacement (ml)= Ending displacement (ml) = Potato type: Potato A: Beginn
How dissimilar are intracellular and extracellular digestion? What is the evolutionary benefit of extracellular digestion? Intracellular digestion is that in which the breaking
Why would we evolve so that when we are stressed our immune system is suppressed? How would this increase survival?
Q. Precautions should be taken while exercising? Being a diabetic the patient has to take a few precautions. These are: - Initiate the exercise programme gently and then bui
Distribution of Nitrate Reductase and Nitrite Reductase Let us see whether nitrate assimilation depends upon the reductants produced in photosynthesis or in oxidative metaboli
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What are the parathyroids? Where are they located and what are the hormones secreted by these glands? The parathyroids are four small glands embedded two in every posterior fac
What kind of eye defect can give rise to short-sightedness? Long eyeballs, large eyeballs, too powerful a lens or a combination of these defects can give increase to short-sigh
List three human activities which could cause the loss of a species. Human activities which threaten species with extinction are: (i) hunting of individual species, (ii) over-
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