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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.
Select all that are true or correct regarding a buffer: alternately donating and accepting ions a set of chemicals that work together to resist pH change often a weak acid or base
How has the position of the stomata changed in some plants to prevent excessive water loss by transpiration? In the some plants that have leaves that receive too much sunlight
Role of Pancreas in Digestion Pancreatic juices secreted from the pancreas aid in digestion of the food. About 600-800 ml of fluid i.e. the pancreatic juice is
Maximum and minimum range of an animal with the factors of Ph Salinity Pressure Relative human
Why does one need to study about soil and what is its importance? You would be aware that, from the dawn of agriculture, cultivators were attracted to fertile soils of river
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Phytoplankton Stage - Hydrarch In this initial stage, the pond water is poor in nutrients and is devoid of much life. At this stage, the water is incapable of supporting large
Male reproductive system of earthworm: Testis : There are two pairs of testis one on eachside of the body in 10th and 11th segments. They produce sperm mother cells. Seminal Ves
What are the uses of WPC? Whey protein concentrates are used extensively in the manufacture of baked goods, where they enhance the effectiveness of shortening through better d
How was it proved in the case of Amoeba that the key to the life of a cell is Nucleus?
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