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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.
Glycogen A. production in the liver increases in response to an increase in blood plasma levels of glucagon. B. is secreted by alpha-islet cells of the pancreas. C. bindi
M a g n etic resonance imaging (MRI): It is in use as a clinical diagnostic tool since 1980. The distribution of hydrogen nuclei (protons), present in cellular wa
The capacity to do work is known as energy. In an ecosystem energy flows through one organism to another in the form of food. The flow of energy is uni-direction and non cycle and
Ethylene production - Responses to Infection Ethylene is also induced in response to infection. It is also known to be produced under other stress conditions like wounding
Morphological Nature of Endosperm The morphological nature of endosperm in angiosperms has been a subject of much discussion in evolution. The endosperm in gymnosperms is a g
How are buffers significant to the functioning of living systems? By neutralizing small amounts of acid or base that might be added to a solution, buffers keep pH values at nor
Defina about the Lipid Metabolism? Animal studies consistently show a hypotriglyceridenlic effect although equivocal results have been seen with healthy humans. Hypotriglycerid
Effects of Kwashiorkor on children Kwashiorker is an African word- it means displaced child. The child is weaned out very early and is given foods having high amounts of carboh
PHYLUM MOLLUSCA Definition and Introduction Basically bilateral and protostomial eucoelomate eumetazoans whose soft body (L. Millis or molluscum= soft) is unsegmente
What type of metamorphosis do spongs go through is it reteogressive?
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