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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.
In many animals, glucose, rather than starch, is transported by the blood through the body to all the cells. Starches in many foods are digested to yield glucose. Why is the digest
Upon admission the DPU nurse notes: Fasting status - fasted from 12 midnight, no morning medication taken. Consent - signed Pre anaesthetic check Test results
Define the Prevention of iron deficiency anaemia? As in the case of vitamin A deficiency, correction and prevention of dietary inadequacy of iron are important sustainable meth
Explain the Transmission Electron Microscope Here, thin and dehydrated specimen is used. Electrons pass through the specimen and form image on to photographic film. These are u
HUMAN SKELETON - Hard supportive or protective elements of the animal body form the skeleton system. It's study in osteology. EXOSKELETO N - Present outside skin. It
Parturient paresis (milk fever, hypocalcaemia) Parturient paresis is an acute to peracute non-febrile disease, which occurs in diary cows and buffaloes usually around the t
How cells are studied We learnt about the evolution of the cell and a historical account of the growth of cell biology. In this section, you will study about the various tools
Q. What are the tissues that form the skin in vertebrates? The skin of vertebrates is made of epidermis is an external layer of epithelial tissue and dermis a layer of connecti
What is ventilation A. An increase in the hydrogen ion concentration in the interstitial spaces of the brain stem leads to an increase in the duration of the respiratory cy
Infective endocarditis (IE) is a microbial infection of the endothelial surface of the heart. The characteristic lesion, the vegetation, is a variably sized amorphous mass of plate
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