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The original DNA sequence when ,transcribed and translated would yield five successive valine residues. But the altered sequence would correspondingly read one aspartate and four serine residues. Mutations resulting from the addition or deletion of base pairs are called frameshift mutations. So far we have discussed the several ways in which the genetic material could be altered. Mutations could be either spontaneous or induced. In recent years there has been a more clear understanding of the causes of mutational process. Tautomeric shifts, ultraviolet radiations, chemicals such as hydroxylarnine, nitrous acid and a variety of alkylating agents can cause permanent alterations of nitrogenous bases. Aromatic compounds such as acridines can cause addition or deletion of one to more than twenty bases in DNA. We have briefly discussed mutations, a way or source of variability in natural populations. Together with recombinations occurring'at the tjnie of meiosis they form the raw materials for selection to act on. Before we discuss briefly about recombination, let us have a quick look at mutation rates in organisms.
Aerobic Based Water Treatment: Waste water provides organic materials and inorganic nutrients to river waters; this is known as eutrophication. This promotes microbial and plan
A thiamine defiency will result in decreased activity of: -G-6 phosphase -transketolase -fructokinase
Transfer of pollen grains from the anther to the stigma of another flower of the similar plant is known as? Geitonogamy
Q. Plant classification according to Ancient Greeks and Romans? Hippocrates, "The Father of Medicine" (460-377 B.C.) is reputed to have been one of Democritus 's disciples. He
Q. What are some signs and symptoms found in patients with hypothyroidism? In hypothyroidism the production and secretion of T3 and T4 are impaired. Since these thyroid hormone
The man-made sources of air pollution are broadly categorized into three: Point or stationary sources: it includes such sources which pollute at particular. Pollutants from
Describe Infectious Agents ? Recently there has been increasing interest in the relation between chronic low grade systemic inflammation and mortality of coronary artery diseas
Define Modelling the evolution of correlated characters? Current discoveries in genomics and proteomics have illustrated that the link between genotype and phenotype is much mo
what is rennin? how does it work? and what is its optimum pH level and activity temperature?
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