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Phenetic ClassificationThis system is based exclusively upon face value of observed characters without direct reference to phylogeny. The taxa are either classified on the basis of a few characters or overall characteristics. When based on a few characters, the groupings are subjected to change on the discovery of natural affinities of the taxa,The greatest weakness in phenetic approach is that it demonstrates a false claim in establishing natural groups as products of the human mind rather than of evolution. It is now a well recognised fact for all natural taxa, especially species with their 'reproductive isolation, that they are not an arbitrary, subjective, man-made phenomena. This approach is quite useful for groups with immature classification and to those with numerous non-redundant characters. It is of no use when applied to higher organisms. The use of computer methods of pheneticists can be of great help in taxonomy if combined with philosophy of evolutionary taxonomy together with a the proper weighting of characters.
In which chloroplast structure are chlorophyll molecules found? Chlorophyll molecules are placed in an organized manner in order to increase the exposure to light on the thylak
STIMULENT S - It makes a person more wakeful, alert and active. (i) Caffeine ( C 8 H 10 N 4 O 2 ) - It is 1,3,7-trimethylxanthine obtained from tea leaves ( Thea si
what are golgi apparatus
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Define the Disorders due to the iodine deficiency? Mild goitre, i.e., a larger thyroid gland than normal. The mildest form of goitre ranges from those only detectable by to
What is meant when it is said that a virus is in an inactive state? Viruses considered in inactive state are those whose genetic material is within host cells without synthesis
Name the state in humans in which the blood cholesterol content becomes abnormally high. a) Explain vernalisation. b) Many villagers near Industrial area vary from "blue bab
The allele that causes albinism (p) is recessive to the allele for normal pigmentation (P). A normal woman whose father is an albino marries an albino man whose parents are both no
Answer the following eight questions (a through h) based upon a tripeptide sequence of the following amino acids (one-letter codes are given): S (serine) P (proline) K (lysine)
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