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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.
An organism having the genotype AaBbCcDdEe is self-fertilized. What are the proportions of gametes that are expected to carry only dominant alleles?
Starch exists in plants as insoluble starch granules in chloroplasts. Each starch granule holds a combination of two polysaccharide forms, amylopectin and amylose.
whats the difference in respiratory system in mammals,reptilia and amphibian?
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Explain Starch - Tests for the Presence of Exoenzymatic Activity? Starch is a polymer of glucose linked together by glycosidic bonds. Microorganisms produce hydrolytic enzyme a
why obelia is of special interest in zoology
What is Posterior Aneurysm? The technique of Posterior Aneurysm operation is the same. Care must be taken to avoid injury to the posterior papillary muscle and poster
Determine the Role as antioxidant? Some carotenoids, in addition to serving as a source of vitamin A, have been shown lo function as antioxidants. Studies show that lycopene. (
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