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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.
Endocrine System In endocrine system ductless gland or specialized cells release chemicals called hormones into the circulating blood. These hormones influence the functions of
How to increase in sodium conductance A complete motor neuron is removed from a frog and placed in normal physiological saline at 1 AM. The neuron is healthy. At 2 AM, the ph
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Chest and Leg Wound Complications : The patients under going CABG are usually elderly, obese and nearly a quater of them are diabetic. So sonic of them get superficial or d
Effects of Noise - Noise Pollution Noise can affect in the following three ways: Interferes with communication, Diminishes hearing and Affects health and even
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Define about the Absorption of Iron? Before it can be absorbed, iron whether it is in the form of haem or non-haem must be released from the food matrices where it is bond with
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Q. How does the inflammation mechanism work? When some tissue injury other vasoactive and occurs histamine substances (called mediators of inflammation) are released, they caus
What is nucleus where it is found? Nucleus : The nucleus is present only in eukaryotic cells. It is the control center and is generally found in the center of the cell. The
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