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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.
How to calculate protein percentage in Lowry method? Ans) By verification of optical density by coloimetric method
State the Definition of respiration Respiration is an act of breathing. (i.e. rise and fall of the chest). Respiration hastwo parts i.e. inhalation and exhalation. When we bre
What is vascular cambium? What are their functions? The Vascular cambium is the secondary meristematic tissue that in roots and in the stem forms the vascular tissues phloem an
Q. What are the allosteric enzymes? Allosteric enzymes are those that have in excess of one activation center and to which other substances, called allosteric regulators, bind.
Phases of Ovarian Cycle In non-mammalian vertebrates the ovarian cycle consists of the following phase; Pre breeding phase Breeding phase and Post breedin
Explain the Consequences of Malnutrition? Malnutrition manifests itself in terms of illness and death in all age groups. Children, pregnant women, nursing mothers and elderly a
How Vitamins and minerals work together with nutrients in food? Vitamins and minerals work together with nutrients in food. While antioxidant vitamins E and C and beta-carotene
Considering a pair of homologous chromosomes containing a gene having two different alleles how many different genotypes can the individual present? If a gene of the diploid sp
Airway: Place the patient supine on a firm surface with his head at level or slightly lower than the level of heart. Immediately, clear the airway and start rescue brea
Name some Drugs to prvent tuberculosis Pyrazinamide can cause morbilliform rash, arthralgias and asymptomatic hyperuricemia, and blocks the hypouricemic action of allopurinol (
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