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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.
Tricks of learn a classification (molusca,arthopoda,prifera etc.)
AMNIOCENTOSI S - Transabdominal aspiration of fluid from the amniotic sac of the foetus is called amniocentesis . It is prenatal diagonestic technique to determine genet
Q. Define Primary and Somatic Sensory Area? Primary Sensory Area - Located in postcentral gyrus in parietal lobes (just posterior to central sulcus). Neurons here receive info
Trichomoniasis Oral metronidazole has been the treatment of choice for trichomoniasis. Tinidazole (Tindamax - Medical Letter 2004; 46:70), a nitroimidazole similar to metronid
What are the archenteron and the blastopore? What is the stage of the embryonic development in which these structures are formed? What are the destinations of the archenteron and o
Auxins The history of discovery of auxin is a fascinating chapter in plant physiology. The hormone auxin was discovered first, through some elegant experiments by Charles Darw
does jellyfish depend on solarenergy
Q. What are the cell movements and how are these movements created? Cell movements are movements executed by cell structures, like the movements of flagella and cilia, the pseu
What are cilia and flagella? Cilia and flagella are structures found in prokaryotes as well in eukaryotic cells. They play defense, nutrition and movement roles for the cell. I
Explain about the Diabetes mellitus? You are aware that diabetes may be diagnosed as an exaggerated response in blood glucose concentration following ingestion of a fixed amou
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