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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.
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Biology : Biology may be defined the study of living organisms. It mainly deals with the characteristics of living organisms and their classification. It is also concerned with the
Explain what is Molds ? Zygomycota, or molds, are a type of fungus made of filamentous hyphae that grow on decomposing material. The molds actually aid in the decomposition pro
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Explain the Clinical Features of PS and VSD ? Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4
Tall (T) plants are dominant and short (t) plants are recessive. Two heterozygous tall plants are crossed. What percentage of the offspring will be tall?
Circulation of nutrients in the coastal zone Circulation of nutrients from the sea bottom to the upper surface, occurs in the coastal regions by two processes Upwelling
Late recurrence of artgirza: This is a reflection of progress of disease in the native coronary arteries distal to the grafts or narrowing or blockage of one or more of the g
what is the skeleton in the different classes of coelentrata known
what is the lungs structure in relation to the excretory system?
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