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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.
Why would a tongue not detect mild sweetness after eating foods with high sweetness? This happens due to of the "desensitization" of sensory receptors on the sensory cells of y
Explain brifly Ribosomes, Endoplasmic Reticulum, Golgi Apparatus ? Ribosomes, Endoplasmic Reticulum, Golgi Apparatus : The cytoplasm contains many ribosomes, which are sphe
Cephalopods - Feeding and Digestion in Molluscs Cephalopods are carnivorous. Tentacles or arms are food capturing organs. The number of tentacles changes in different cephalop
Explain Neurologic disease For patients with facial nerve palsy alone, oral doxycycline or amoxicillin may be effective. Patients with other neurologic involvement, such as men
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Determine the Adequacy of children's food? Adequacy of children's food and nutrient intake depends on: Sibling company Peer pressure Model set by parents and
Define Steps To determine thermal resistance of a microorganism? Most food components and microorganisms obey first order reaction kinetics, which means that the destruction ra
Non-Conventional Feed Resources There are many non-traditional or non-conventional materials which are available in abundance and can form potential source of feedstuffs for f
PROVIDE a specific example for epithelial and connective tissues, how the arrangement of cells helps with tissue functioning?
Q. What is the crystallization of a virus? What is the significance of this process? Crystallization is the procedure of transformation of viral components into organized solid
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