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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.
Somatic Embryogenesis The process of embryo development is called embryogenesis. It is not the monopoly of the egg to form an embryo. Any cell of the female gametophyte (Embr
Q. What is Sulphonylureas? Sulphonylureas: Tolbutarnide is the mildest and its effect remains for 8 hours hence 2-3 doses need to be taken. Another drug chlorpropamide needs on
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Q. Why does not a long lasting vaccine against common cold exist yet? Viruses that present a high mutation rate like the virus that causes the common cold escape easily from th
Define Advantages of using Yeast as a source of Protein? 1. Large size, hence separation from the culture medium is easy. 2. As the pH of the growth is towards acidic side,
name two examples of biotechnology that use recombinant DNA technology and two examples that do nnot
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Define the Recommended Dietary Allowance for Vitamin B 12 (RDA)? Vitamin B 12 deficiency is common in true vegans who can be treated with small doses since the daily requirem
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What are the factors to an actual shift in the supply curve? Factors which cause an actual shift in the supply curve are described in below: When prices rise or fall this wo
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