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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.
Illustrate the diabetic contract of the eye? Diabetic Cataract: 1) Sorbitol Aldose Pathway: In patients with diabetes, there is increase in sugar alcohol which results in
Hormones in Metamorphosis of Amphibia In amphibians, the changes that take place during metamorphosis are brought about by hormonal secretions of the thyroid gland. The first
What do you understand by Serial homology? Metamerization results in a linear series of segments which share a common embryonic origin. Ancestrally, all metameres were identica
What are the infructescences, pseudofruits and parthenocarpic fruits? The Infructescences are aggregated fruits formed from inflorescences, aggregated flowers. Grape clusters a
PHYSICAL EXAMINATION OF A CHILD This practical as you have seen above deals with assisting in various diagnostic procedures of a child. The first responsibility of you as a
Conduction in Myelinated Axons The myelin sheath provides insulation for the axon preventing movements of Na + and K + through the membrane. Therefore, if this myelin sheath
Explain the Decolourizing Agent - Ziehl-Neelsen Method? Acid alcohol - a mixture of 95% ethanol and 3% HCI - is used for decolourization. Before decolourization, smear is allow
Both global and regional systolic function are to be checked. Global measures include ejection fraction, stroke volume, end systolic volume. (For measurement of systolic function u
what is microbiology
CHORIONI C VILLUS SAMPLING (CVS) - CVS is done during 8th-10th week of pregnancy when abortion is safe. For CVS cells are sucked into a catheter passed through the cervix.
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