Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Gene or point mutations occur when the DNA sequence of a gene is altered and the new nucleotide sequence is passed on to the offspring. This occurs either due to addition or deletion or substitution of one or a few nucleoticles. Nucleotide substitutions can be either transitions or transversions. Transitions are replacements of a purine by another purine (A by G or vice versa) or a pyrimidiile by another pyrimidine (C by T or vice versa). Transversions are replacements of a purine by the pyrimidine or vice versa (G or A by C or T or vice versa). We will briefly explain the different types of gene mutations.
a) Substitutions : substitution of one base by another would result in an altered amino acid in a polypeptide chain. For instance triplet AAT in DNA (UUA in mRNA) would specify leucine. But if the first A is ieplaced by C, it will code for valine. Some of the codons are degenerate and substitutions may not alter the amino acid specified. For instance, in the triplet AAT if the first A is replaced by G the amino acid coded would still be leucine. Gene mutations which do not normally affect the active site of a protein will not alter its biological functions. But nucleotide substitutions that change a triplet coding lor an amino acid into a termination codon would produce adverse effects. Once again in AAT, if the second A is replaced hy T (An), the resulting rnRNA codon IJAA is a termination codon. When a termination codon is present in the middle of an mRNA molecule the subsequent codons are not translated and an incomplete polypeptide will be released from ribosomes.
phylogenetic consideration
Which process may not reduce the toxicity of a chemical in the body?
Percussive instruments -this method used a selected and controlled percussive removal force -Instruments delivers an impact either directly to a restorative or indirectly t
Name of the ductless glands that secrete their product into the circulatory system are: a) Exocrine (pron: ek-seh-kren) b) Apocrine (pron: ap-eh-kren) c) Holocrine (pron:
Determine the Symptoms of bacillus cereus Extremely large numbers (10 8 per gram) of viable cells of B. cereus must be ingested to develop signs and symptoms of the syndrome.
Leaves give off water vapour Use two same pots of soil, one with a small plant and the other without. Cover the soil in every pot with cardboard as shown in the diagram after w
Which is the typical feature of the hookworms related to the way they obtain food and explore the host? Both Ancylostoma duodenale and Necator americanus have mouthparts with h
Define Advantages of using Yeast as a source of Protein? 1. Large size, hence separation from the culture medium is easy. 2. As the pH of the growth is towards acidic side,
DIFFERENC E BETWEEN SPERMATOGENESIS AND OOGENESIS - S.NO . SPERM A T OGENESIS OOGENESIS 1. 2. 3.
Q. Echinoderm identity card. How are echinoderms characterized according to examples of representing beings, basic morphology, type of symmetry, germ layers and coelom, respiratory
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd