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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.
Explain the process by which the kidney varies the volume and concentration of urine
Q. What is Suprasternal Views in echocardiography? To complete the echocardiography in the patients with CHD these views are essential. For optimal windows patient should lie
The crude oil obtained from earth's crust is refined by following steps. Step 1: separation of water Cottrell's process is used for separation of water. Crude oil is an emu
What is the meaning of Ideometric approach Ideometric approach in the context of neuropsychological assessment emphasises the patient's premorbid functioning with reference to
Companion cells are the specialized cells in the phloem which load sugars into the sieve elements and help to maintain a functional plasma membrane in the sieve elements.
how do work in human body and animals
Define the term Archenteron ? The name given to the primitive gut, the first tube that runs through the developing embryo and is open to the external environment. Formed during
Birth Marks (Naevi): Birth Marks is also known as naevi. It is a multiplication of one or more cutaneous elements within the skin. It is defined as a congenital, ci
Q. How does phosphocreatine act in the muscle relaxation and contraction? Phosphocreatine is the major means of energy storage of the muscle cells. During relaxed periods AT
Q. Risk Factors for GDM? If any of the following risk factors are present in a woman, she may develop GDM: 1) Presence of obesity. 2) If any family members (parents, brot
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