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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.
Iodine Iodine functions are essential components of the thyroid hormones thyroxine (T 4) and triiodothyronine (T3), which regulate the rate of energy metabolism. Absorbed iodi
What gases will be taken in and given out by a green plant (a) in darkness, (b) in bright sunlight? a) In low light intensities a green plant will be taking in oxygen and
Q. How does the sexual arousal mechanism in women facilitate fecundation? During sexual arousal in women the vagina secretes substances to neutralize its acidity thus allowing
Q. Explain Spoilage of Soft Drinks? We all consume soft drinks, fruit juices, as well as, preserves, which normally are available in the market as tetrapacks, cans, bottles
TYPES E.R. consists of two types - 1. Rough E.R. 2. Smooth E.R. R o ugh E.R. S m o o th E.R.
Determine the Parts of Stethoscope A stethoscope having of earplugs, binaural pieces, flexible tubing, a stem, and a chest piece. The earplugs are attached to springs made of s
Primary and secondary solid fuels are widely used in domestic and industrial purpose. Wood and coal constitute the important primary solid fuels. The important secondary solid fuel
what are protein? What is the constituential uni. Of protein? Briefly explain the various forms of protein?
What are the types of reproduction that occur in fungi? In fungi there are asexual and sexual reproduction. Fungi replicate asexually by fragmentation, gemmation and sporulatio
Explain the Gram Staining technique? Gram staining is a differential staining procedure which divides bacteria into two groups: Gram positive and Gram negative, based on staini
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