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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.
How is the respiratory system of beings of the phylum Annelida characterized? Respiration in annelids can be cutaneous or branchial. Cutaneous respiration happens due to the r
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Define lipids 'lipids' defines substances as oils, fats and waxes which can be only characterized by a large array of properties. They are in general: - coming from plant
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Simultaneously with the formation of two daughter nuclei, a cleavage furrow appears in the middle of the cell. The furrows gradually deepen and divide the cell into two daughter ce
Where does cartilage occur in a joint and what is its function ?
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Possible causes of elevated triglycerides: - Obesity - Alcohol - Uncontrolled diabetes - Hypothyroidism - Genetic - Liver disease - Drugs Possible causes o
Which of the following processes assist in the maintenance of high levels of dissolved solutes in the interstitial spaces of the kidney medulla? A. Net flux of sodium ions from
New advancements and discoveries related to oogenesis
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