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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 spinal cord? Of which elements is the spinal cord constituted? The spinal cord is the dorsal neural cord of vertebrates it is the part of the central nervous sys
Acute GAS pharyngitis should be treated promptly by penicillin or other antibiotics. Indian Council of Medical Research (ICMR) recommends that all cases of pharyngitis must receive
Adverse effects of Fungal Prophylaxis - Micafungin is generally well tolerated. Adverse events have included fever, headache, nausea, vomiting, diar-rhea, leukopenia, hepatic e
The typological species concept was suggested by Plato more than 2000 years ago. According to this concept, the immense variety in nature can be reduced to a few "types". Individua
BACK CROSS When F 1 individual (Tt) is crossed with one of the two parents, either tall (TT) or dwarf (tt), such a cross is called the back cross. There are two possibilities
Explain Bone Healing Process in Nutritional Care? Protein is essential for callus formation, calcification and bone healing especially in cases of orthopaedic surgery. The prot
Explain the Localized Aggressive Periodontitis Localized Aggressive Periodontitis: It has been in literature that transmission of peridontopathic microorganisms from periodon
A bee visits several flowers in succession on a single willow herb plant. In doing so, the bee transfers pollen from the younger flowers, near the top of the inflorescence (group o
Q. Determine the sucrose content in a sample of honey? This activity will help you to: • estimate the non-reducing sugars and total sugars in a sample of honey, • check t
Could you survive on a diet which contained no carbohydrate? It should be possible to survive without carbohydrate as energy can be obtained from fats and proteins.
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