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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 about common congenital heart diseases ? Congenital Heart Disease is commonly classified as acyanotic and cyanotic. Acyanotic Left to right shunts Obstructive Lesion
How different are the respiration in fishes and the respiration in adult amphibians? In fishes gas exchange is completed by direct contact of water with the branchiae (gills).
Q. Describe the pulmonary artery? The main pulmonary artery is seen on the PA view, as its left border forms the pulmonary bay. The right pulmonary artery runs horizontally to
Food Applications of Curdlan Curdlan has a variety of food applications as enumerated herewith: a) Meat and Poultry Curdlan makes meat and poultry products juicier and
Q. Requirement for nutrients? Ulcer is a form of wound which if not healed on time call get perforated and bleed. Adequate protein intake ensures synthesis of new tissues esse
According to their functions how can nutrients are classified? One possible and utile functional classification for nutrients is the one that divides them into energetic, struc
Q. Explain Rodent Control and pests? In any food establishment, varieties of insects, pests and rodents pose a big threat to the maintenance of hygienic surroundings. They
Is the epithelium vascularized? How do nutrients and oxygen reach the epithelium? Why is this feature a significant evolutionary acquisition? Epithelia are not vascularized (ca
Describe the factors that are involved in the regulation of respiration in a child who decides to hold his/her breath for as long as possible.
Kinds of Hermaphroditism Depending upon the timing of maturity of the gonads, hermaphroditism can be of two types 1. Simultaneous hermaphroditism . Both male and female g
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