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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.
State the Principle of Adaptation The first principle is that the central goal of assessment is to promote the adaptation of the child, rather than simply to document the prese
How might the destruction of large areas of tropical rain forest have world-wide consequences? As plants consume CO 2 during photosynthesis, extensive deforestation could resu
What is the initial concentration of Beta-adrenergic receptor in blood?
how do i classify mythical creatures into a web?
Standardisation Research of Luria Nebraska There are published manuals for the Luria Nebraska that define the battery in detail and provide information pertinent to validity,
Cell secretion is the elimination to the exterior of substances formed by the cell (for example, hormones, mucous, sweat, etc.)
Q. Can you explain Ventricular Tachycardia? The term is usually reserved for at least four or more beats and modified by the term non sustained. Short runs of non-sustained VT
Give the causative organism and symptoms of Bacillary Dysentery • Bacillary dysentery is caused by Shigella sp. (Shigella sonnei, S. dysenteraei). Incubation period is
Environment impact assessment (EIA) is a tool used for decision making regarding developmental projects and programmes and it may be defined as formal process used to predict the e
Explain the Eukaryotic Gene Expression ? Eukaryotic cells regulate the transcription of individual genes, large parts of chromosomes, or even entire chromosomes. Gene expressi
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