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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.
Adverse Effects of Acyclovir By any route of administration, acyclovir is generally well tolerated. Gastrointestinal (GI) disturbances and headache can occur. Given IV, the dr
Other Psychiatric Emergencies: 1) Psychotropic Drug Withdrawal Abrupt cessation of antipsychotic, benzodiazepines result in symptoms of withdrawal including abdominal pain, i
Do echinoderms present internal or external fecundation? Is there sex division among individuals? The fecundation in echinoderms is external; gametes are liberated in water whe
OPIUM - Opium is milky latex obtained by incising the unripe capsule of white poppy ( Papave r somniferum family paprarecea) It has eaten or smoke. Generally it
Name two ways in which the chances of hypothermia can be reduced during outdoor activities. Eating well before going out and wearing warm, wind-proof clothing can reduces the c
What do you mean by Advanced characters The traits, or characteristics, that an animal has that are not ancestral to the taxon. They appear later in the evolutionary history of
Explain about the various Cooking methods? All of us eat food either raw or in cooked form. Have you ever thought why we need to cook food? Cooking is a primary process to mak
BLOO D CLOTTING - It is a nature's device to check the excessive loss of blood from an injury. Bleeding time is 1-3 minutes. Clotting time is 2-6 minutes. Process of
By now you know that diabetes cannot be cured but can be treated so that an individual leads a normal life. Patients who maintain their blood glucose levels within the normal range
If a spectrophotometer can read accurately within the range of 0.1-1.0 optical density units, then how can you obtain the absorbance of a stationary culture (which may have an A550
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