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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.
Q. What is the use of Uncoated polyvinyl chloride? Uncoated polyvinyl chloride (PVC) and polyvinylidene chloride (PVDC): PVC and PVDC are closely related plastics that are a
Can two normal individuals of the same species with sexual reproduction have identical genomes and identical karyotypes? How is the human karyotype usually represented? Except
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What are hexoses? What are some examples of hexoses with important biological functions? Hexoses are carbohydrates made of six carbons. Glucose, fructose and galactose are inst
Salt Glands in Birds and Reptiles Marine reptiles for example, iguanas, estuarine sea turtles, crocodiles, sea snakes and marine birds like the marine teleosts do not produce
the main excretory system in lower animals
Classification of Enzymes : Enzymes are classified into the following six main categories in according with the nature of reaction the catalyze: 1. Oxidoreductases
What is polyembryony? Polyembryony is the phenomenon in which a single embryo in its initial embryonic stage separates itself forming many new individuals of the similar sex an
Explain some Limitations of Most Probable Number? 1. Large quantity of glassware is required. 2. Colony morphology cannot be determined. 3. It lacks precision.
Some biologists prefer to categorize brown, red, and some green algae as plants rather than protists. What characteristics of these algae support like classification? Brown and
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