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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.
How Fever,Illness,Infections,Injury affects the BMR? Any illness or fever caused by an illness influences the metabolic rate. Fevers increase the metabolic rate by about 7% for
why is epidermis peeledsuggest why a marine amoeba does not have a contractile vacuole
Explain Homogenization Homogenized milk will not be affected, as the fat globules are already broken up. Homogenization increases the viscosity of whole milk but slightly dec
DEFINITIONS E mbryology - Study of embryo is called as embryology. Zygote to emrbyo in uterus Developmental biology - Study of pre natal period & post natal period
Question 1 Write a short note on the following- Plasmids Retrotransposons Hfr Conjugation Generalized transduction Question 2 With the help of a neat diagra
Q. How different are gymnosperms from pteridophytes and bryophytes? Gymnosperms are not cryptogamic as pteridophytes and bryophytes are. They are phanerogamic and so they form
Embryology in relation to taxonomy?
Reproductive System of Asteroidea Sexes are separate in several asteroids. There are ten (10) gonads, two in each arm. They emerge tuft-like or as cluster of grapes. Mature go
Define National Iodine Deficiency Disorder Control Programme (NIDDCP)? The prevalence of iodine deficiency disorders (IDD) are seen more among adolescent's young adults and sc
state 3 ways human activities add carbon to the atmosphere
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