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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.
Algae Advantages a) Produces proteins which have almost all the Essential Amino acids. b) Rich in tyrosine and serine, low in sulphur containing amino acids.
Define Limitations for underwater weighing method? This method is expensive, time consuming and usually requires a lot of equipment and space. The subject needs to be
In the more highly developed animals, like humans this gas is used to regulate activity of the heart, blood vessels and respiratory system. WORKING MUSCLES PRODUCE A LARGE AMOUNT O
How does phosphocreatine act in the muscle contraction and relaxation? Phosphocreatine is the main means of energy storage of the muscle cells. During relaxed periods ATP mo
PHYSICA L PROPERTIES All monosaccharides which have an asymmetric carbon are able to rotate polarized light either to left side ( laevorotatory ) or right side ( dextroro
Q. Besides the skin what are the other coverings of the body? Besides the skin there are other covering tissues made of epithelium over other tissue layers. They are the tissue
Digestion of carbohydrates Carbohydrate digestion in vertebrates and invertebrates is very similar. All the enzymes shown in Table are not required by all animals. The enzymes
Acyanotic Congenital Heart Disease In this infant has no cyanosis because there is no abnormal communication between pulmonary and systemic circulation or there is no mixing
Define Nutritional Requirements of Fats and Oils? As with the other macronutrients, we do compute requirements of visible fats too for all age groups and give guidelines for se
Photosynthetic function Structural organisation of the leaf is suitable to perform the process of photosynthesis. Hence leaf is called as a food factory. The leaf has a l
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