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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.
Why Deficiency of Folate take place? If there is inadequate dietary folate, the activity of both the DNA and the methylation cycles, described above, will be reduced. A decrea
HDLs have the opposite function to that of LDLs in which they deleted cholesterol from the tissues. The HDLs are synthesized in the blood mainly from components derived from the d
Explain the role of dietitian's in feeding dilemmas Usually, the dietitian's role in feeding dilemmas is seen as secondary and the physician's role is the focus. In reality,
Q. What are few examples of mineral salts from the diet that act as coenzymes? Magnesium, copper and zinc are examples of biological coenzymes. Q. What is the disease cause
Chitra Valve : This valve was designed and developed at Sri.Chitra Institute of Medical Sciences in Thiruvananthapuram and marketed by TTK Industries. It is a tilting di
ADRENAL OR SUPRARENAL GLANDS (GLANDS OF EMERGENCY) - These are paired structures located on the top of the kidneys. Each adrenal gland has two parts external adrenal cort
What is Kingdom Plantae and what organism included in Plantae? Kingdom Plantae : includes organisms that are eukaryotic, multicellular, photosynthetic. Their cells also cont
Explain Procedure for Checking the Presence of Rhodamine B? Conduct the experiment following the procedure given herewith: 1. Pour liquid paraffin or mineral oil in a Petri
The fragility of erythrocytes The fragility of erythrocytes is impaired in the absence of NADPH generation due to the deficiency of glucose-6-phosphate dehydrogenase thereby ca
Define Calcium, Phosphorus & Vitamin D required for Elderly? As mentioned earlier, due to the change in skeletal system, vitamin D and calcium needs increase with age. Bone min
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