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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.
Explain the process by which growth factors promote angiogenesis. Add citation or links.
Describe Schizocoelus and its role. One of two ways that a body cavity forms within mesoderm. (The other is enterocoelic pouching.) Block of mesoderm splits apart to create the
State in brief about the Zinc It is concerned with the functioning of sulphydryl compounds, such as cysteine, in regulation of redox potential within the cell. Zinc is somet
What does skin color in man shows?
Explain the two forms of hemicellulose There are two forms of hemicellulose - Hemicellulose A and B - Hemicellulose A is precipitated upon neutralization of an alkaline extract
Q. What is Impaired Glucose Tolerance? Glucose tolerance is assessed by taking the fasting blood sugar value. An oral glucose load of 75 grams glucose is administered and blood
Stratification - Aquatic ecosystems Aquatic ecosystems also exhibit marked stratification. In lake and ocean ecosystems light penetration, temperature and availability of oxyg
Q. (a) In droplet infection (i) where do the droplets come from, (ii) what infective agents might they contain? (b) Give two examples of diseases normally spread
What are the nutritional components of the foods we consume? The foods that we consume are composed of varying quantities of the following nutritionally important components:
Define Brain Stem Brain stem consists of three parts i.e. midbrain, pons and medulla oblongata. The functions of the Brain Stem are: Brain stem contains points of cranial
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