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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.
#question.bacteria and virus are meet so what happen.
What are the advancement of cnidaria over protozoa
Connecting implants to natural teeth and use as pier abutments The issue of connecting implants and teeth to support a fixed prosthesis is controversial and unresolved. The inh
Pachytene: The pairing of homologous chromosomes is completed. Chromosomes become more and more thick. Each bivalent has four chromatids , which wrap around each o
What is Joints Joints are locations where two or more bones come together, or articulate. Bones are joined with varying degrees of rigidity. Joints may be fixed, as in the s
What are the scopes of Zoology?..
Food Applications of Locust bean gum Locust bean gum has multiple applications in food industry. Let us focus on a few of the important ones: Locust bean gum has been u
Explain the Toxicity of Folate? There is no evidence to suggest that it is possible to consume sufficient natural folate to pose a risk of toxicity. However, this clearly does
Q. Define Direct Visualisation of Coronary Arteries? Ans. Coronary arteries cad be directly visualized using two-dimensional echocardiography, especially in patients with
what are the methods of seed formation
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