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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 Physical activity ratio? Physical activity ratio (PAR): The energy cost of an activity per unit of time (usually a minute or an hour) expressed as a multiple of BMR. It
Theor y of Epigenesis (i) It was proposed by C.F. Wolff & supported by Von Baer. (ii) Wolff proposed that germ cells contain definite but undifferentiated
Define Risk management Risk management is defined for the purposes of the Codex Alimentations Commission as "the process, distinct from risk assessment, of weighing polic
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What is the external rigid carapace of arthropods called? Of which substance is it made? Which type of organic molecule is that substance? The external carapace of arthropods i
Heparinisation : The patient should be fully heparinised before the start of cardio pulmonary bypass. Baseline activated clotting time is measured (ACT). 3 mg (300 units) per k
What evidence is there that makes it seem humans have more than a material existence?
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