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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.
The cell cycle undergoes a sequence of changes which involve a period of growth replication of DNA, Followed by cell division. This sequence of changes is called cell cycle.
what so special for phylum annelida
Herbage area or vegetation cover Herbage area or vegetation cover is an important aspect of vegetation study in understanding the nature of a community particularly in evaluat
Particulates: These are suspended droplets, solid particles or mixture of two. So all the atmospheric substances that are not gases are called particulates. A number of term
State the term in broad - Lunule. In sand dollars, notches or holes which pass through the body of the animal. Their function is not fully understood though may be involved in
In interspecific sterility, the failure in mating occurs because of inability of the sperm to reach the egg in animals and the pollen to reach ovules in plants. In plailts interspe
What information does the pain receptor relay to the brain about stimuli below threshold
The highest possible magnification that can obtain when using using a microscope?
Q. Prevalence of coronaru heart diseases? Incidence of obesity, diabetes and CHD is increasing in India in almost all age groups. At present, obesity, which is a major risk fa
Q. What are alkalosis and acidosis? Acidosis is the condition in which the blood pH is abnormally low Alkalosis is the condition in which the blood pH is abnormally high Normal
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