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Q. Phylogenetic species concept ?
Taxonomists (scientists who compare, classify and name organisms) tend to describe a species by studying their physical characteristics and behaviour, and also their genetic and chemical similarities and divergences as a result of evolution. Based on this concept Cracraft proposed the Phylogenetic Species Concept (PSC) in 1983. Here he defines a species as "the smallest diagnostic cluster of individual organisms within which there is parental pattern of ancestry and decent." However, it can be argued that a population, subspecies, stage or a morph can then be elevated to species status. Consequently the number of species recognised becomes highly dependant on the analytical tools used. Even so, the PSC is considered as the most valuable tool for working taxonomists.
Define the Physical and Chemical Factors That Affect the Pasteurization? There are a few other physical and chemical factors that affect the pasteurization method. These involv
Q. Is there an exchange of cells between the mother and the fetus through the placenta? Under usual conditions there is no passage of cells across the placenta during gestation
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what we the strengths and weaknesses of pangenesis theory
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