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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.
Explain Vitamin A Deficiency - Micronutrient Deficiencies? Vitamin A deficiency (VAD) is a major public health problem, and the most vulnerable are preschool children and pregn
Explain Class Bivalvia in animal kingdom? This name of this Class reflects the group's most distinguishing feature. Clams, oysters, scallops and mussels all have two shells tha
Define Some Food Related Problems in parkinson's disease? As the disease progresses some food related difficulties appear. These are: 1. Difficulty in food preparation
Ciliated Protozoan Ciliates form the largest and the most homogenous group of protozoans. They are placed under one phylum Ciliophora and evidence indicates that its members s
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 s
Altitudinal Variations We know that temperature decreases with increasing altitude. This is mainly due to convection currents in the troposphere - the lowermost (and most dense
In the eukaryotes, the transmit RNA genes exist as multiple copies and are transcribed by RNA polymerase III or RNA Pol III. As in prokaryotes, various tRNAs may be transcribed tog
write short note on feeding mechanism in holozoic organism
What is Sodium Bicarbonate? The administration of bicarbonate may be considered if the pH remains below 7.1 or if hyperkalemia or tricyclic antidepressant overdose is suspected
State the concept of type locus interaction Some of the major contributions included the concept of type locus interaction, the analysis of quantitative as opposed to qualitati
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