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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 xylose isomeras A mixture of glucose and fructose, is produced from sucrose by the action of yeast invertase (β-fructofuranosidase), an enzyme which can only be extrac
What is xaxim? Most pteridophytes have subterraneous stems parallel to the substrate known as rhizomes. Xaxim is a type of pteridophyte with an aerial stem generally perpendicu
when the father and the mother of a newborn baby possesses blood group ''O'' +ve,is it possible that the baby can have a blood group ''A'' +ve or ''B''+ve ? Conventionally it shoul
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Define Key Concepts and Facts about Disaccharides? 1. All disaccharides contain 2 monosaccharides. 2. Disaccharides are linked by glycosidic linkage. 3. If both the functional
Imagine a population evolving by genetic drift in which the frequency of allele K is 0.65. What is the probability that at some point in the future allele K will drift to a frequen
Q. What is the destination of the branchial clefts in humans? In humans the branchial clefts located in the anterior region of the pharynx also known as pharyngeal clefts are p
TRISACCHARIDES The oligosaccharides are made of three monosaccharide residues. A common trisaccharides is Raffinose which is formed by condensation of galactose-glucose-fr
T ra n sge n i c animals There are various definitions for the term transgenic animal . The transgenic animal is an animal in which there has been a deliberate modifica
Cells is a Miniature Chemical Factory Due to its incessant metabolic processes, a living cell earns the attribute of a miniature chemical factory metabolites and free
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