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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.
Explain Acute Renal failure Acute Renal failure: Renal failure associated with burns or other trauma or with sharp infection or obstruction of the urinary tract.
Eyes We have a pair of eyes. They are held in socket of the skull by four rectus muscles and two oblique muscles. These muscles control the movements of the eyes. The wall of t
Q. What is the ecological importance of fungi? Fungi are decomposers and heterotrophs they break down dead beings and they actively participate in the recycling of organic mate
MISUSE OF BIOLOGY - Biological achievements are used against human race, e.g. 1 . Bioweapons anitbiotic resistant infective micro-organism are used in wars. e.g., A
Explain the drawback of protein hydrolysates The drawback of many protein hydrolysates, is that when hydrolysed, most of the food proteins liberate bitter tasting peptides, wh
Define Clinical Manifestations and Nutritional Problems Associated with Cancer? In the previous section we learnt that cancer results in several changes in the metabolism of ca
Cytoplasmic inclusions are cytoplasmic molecular aggregates, like as pigments, organic polymers and crystals. They are not considered cell organelles. Fat drops and glycogen gra
Q. What is pericardial effusion? A pericardial effusion is viewed as an echo free space surrounding the heart, most commonly seen posteriorly. Echocardiography provides
Functions of Synergids Ultra structurally the structure and concentration of cell organelles reveals that synergids are metabolically active. The following Wee functions are a
Q. What is the difference between diastoleSystole and systole and diastole are the two stages into which the cardiac cycle is divided Diastole is the stage of the cardiac cycle
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