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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.
Metallurgical coke should have following characteristics: 1. Purity: low amounts of moisture, ash, sulphur & phosphorous should be present. 2. Porosity: it should b
Increase in population size is known as population growth. It depends upon number of persons added to the population and number of persons lost from the population. Addition in pop
In a possible future scenario, male fertility drops to zero, but, luckily, scientists develop a way for women to produce babies by virgin birth. Meiocytes are converted directly (w
what is the population for percentage of people being overweight
Define Food Components Other Than Essential Nutrients? In the previous units so far, we have read about the six major nutrients, which are essential for us. Though these vary i
Briefly explain the difference between stabilizing selection, directional selection, and disruptive selection.
Medication The patient is advised to continue antibiotics for a week more after discharge. Other medications prescribed are analgesics (acetaminopen), cough syrup, diuretics
What are some diseases characterized by progressive loss of the axonal myelin sheath? Multiple sclerosis is a severe disease caused by progressive destruction of the myelin she
Some amount of energy is generatred from the oxidation of food materials is released as heat. This can be proved by germinating seeds. Aim: To show that heat is liberated during re
Evolutionary changes that occurred in humans are - Development of prominent chin. Increase in cranial capacity. Reduction of brow-ridges. Development of speech. Developme
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