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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.
Which are plant tissues that form the plant roots? Roots have a central portion called medulla made of vascular tissue outer phloem and inner xylem. Medulla is delimited by per
What is the significance of Choanocyte? Unique collar-shaped cells whose flagella are responsible for generating water current in the sponge. As flagella beats, food particles
Q. Dietary approach for pectic ulcer? Let us now move on to understand the dietary approach. We shall begin with the nutrient requirements of the patients. However before we ta
Advantages of vegetative propagation Vegetative propagation helps to maintain fixed qualities and characteristic features of the parent plant. For Example in ornamental p
Describe the term Physiotherapy? Patients who are sedated, intubated and ventilated are not able to deep breathe, cough and clear secretions. Hence, it is important to do chest
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A solid compound was found to contain 42.11% C, 51.46%O and 6.43% H by weight. The molecular weight of the compound was 341. What is the molecular formula of the compound?
Q. Etiologic factor of atherosclerosis? Various factors are responsible for atherosclerosis. These include: 1. Hyperlipidemin: Excess circulating fats in blood especially th
Define Precautions for Testing Quality of Water? 1. Handle the sewage water with care as it may contain enteric pathogens. 2. Sewage and pond water should be shaked before i
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