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In the previous section we discussed the concept of species in detail and concluded that the concept of biological species and Mayr's definition of species have a wide acceptance among biologists. In this section we shall proceed to discuss the mechanisms of speciation or the mode of formation of a species. Mayr's definition of species amply makes it clear that to qualify for the title of the species, the individuals must be reproductively isolated from other groups. This naturally raises a question whether a new species could arise from populations occupying the same territory. In other words, should the populations of parent species live in quite separate territories in the formation of new species? In our earlier discussions. on natural selection, you have learnt that originmof adaptations is a gradual process, This is much more true of speciation. Biologists recognise three different kinds of speciation.
Describe the concept of soil testing Different grades of complex and mixed fertilizers are being marketed to suit the soil and crops of a region. The recommendations are made o
What are the functions of biotin and pantothenic acid for the body? How are these vitamins obtained? Biotin (also called as vitamin B8) is a vitamin that acts in the metabolism
Determine the Diet chart for Adolescents? For adolescents, other than points covered above, there are two more important points of considerations. Inanition Fad diets
Extruded Starch Cereal products, that are prepared by pumping cereals through a small opening for instance, pasta, Ready-to-eat cereals etc.
Q. Considerations for congestive cardiac failure? - Subjects with congestive cardiac failure often tolerate small frequent meals better than larger infrequent meals as these a
Amantadine Treatment with oral amantadine or rimantadine begun within 48 hours after the onset of illness decreases the duration of fever and symptoms by about 1 day. Whether t
Medical Research - Conservation of Wildlife Many animal species are used to test drugs and vaccines and to increase our understanding of human health and disease. The nine-b
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What are the three main types of trophic pyramids studied in Ecology? The three types of trophic pyramids studied in Ecology are the numeric pyramid, the biomass pyramid and th
what is the excretory system of a crab?
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