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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.
Observing root hairs Study the root hairs with a hand lens and view how they are constructed.
State the term - Functional neuroanatomy Functional neuroanatomy focuses on the study of anatomy using psychological measures. One application of this kind of research is to he
Explain the Magnesium Deficiency and Toxicity? Deficiency of magnesium is rare for two reasons: frstly, the mineral is widely distributed in the foods, secondly, kidney is able
explain the lock and key theory
Q. What is membrane? Membrane is any delicate sheet that separates one region from another blocking or permitting completely or selectively the passage of substances. The skin,
What is Phylum Platyhelminthes - Flatworms ? This Class consists of the free-living flatworms, the best known of which is the Genus Planaria. Most of the species in this class
What is the dichogamy? Dichogamy is phenomenon of the maturation of female reproductive structures of the plant in a different period to the maturation of the male reproductive
Resistance to Isoniazid The most common pattern of resistance is isolated resistance to isoniazid, which can be treated with rifampin, pyrazinamide and ethambutol for 6-9 mont
For a particular assay, you require cells at a concentration of 300 cells per ml. In your flask of cells growing you counted a sample using a hemacytometer and found that you have
Special studies to diagnose IE caused by fastidious bacteria and other organisms must be performed (serological studies). Thereafter, unless clinical or epidemiologic clues suggest
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