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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.
OBJECTION OF CELL THEORY (REASONS OF DISCARTION) (i) Living organism are composed of various types of cells and their product but members of monera & protista don't have
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Q. What do you understand by Cyanogenic glycosides? Cyanogenic glycosides are present in a number of food plants and seeds. Cassava is a staple dietary item in tropical Afri
bone modeling may occur?
Definition of a neuropsychological test The best definition of a neuropsychological test has been offered by Ralph Reitan, who described it as a test that is sensitive to the
Q. What are the hydrophobic molecules (or hydrophobic molecular regions)? What are the hydrophilic molecules? How can they be characterized in relation to their polarity? Hydro
Approximate Composition of Human Tissue Table gives the approximate composition of human tissue. We all know that carbon, oxygen, hydrogen are present in water and other organ
Describe about diagnostic approach for congenital heart disease ? In this section we propose to outline the principles of a diagnostic approach that is applicable to newborns,
What are the Technique of Operation Cardiovascular Surgery? Technique of Operation Cardiovascular Surgery : The operation is done on cardiopulmonary bypass with profound h
Q. Explain about Rheumatic Heart Disease? Rheumatic Heart Disease (RHD) is a very common cause of cardiovascular disorder in children and adolescents in India. This disease inv
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