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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 Inotropes and Vasopressors Persisting hemodynamic instability after correction of hypovolemia would necessitate the use of vasoactive agents. Which drug or interventio
Precautions It is a common observation that BP recordings are variable when taken by different individuals. To decrease this variability it is important that certain precautio
Define the Bioavailability of Vitamin K? Very little is known about the bioavailability of the K vitamins from different foods. It has been estimated that the efficiency of ab
Reproductive Cycle The whole reproductive cycle consists of an ovarian cycle and a uterine cycle. Figure illustrates one complete reproductive cycle. You can observe in the fi
Explain Nutrition diagnosis Nutrition diagnosis is the identification and labelling that describes an actual occurrence, risk of, or potential for developing a nutrition probl
what is a seed?
Explain the Magnesium Deficiency and Toxicity? Deficiency of magnesium is rare for two reasons: frstly, the mineral is widely distributed in the foods, secondly, kidney is able
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How many protein require patient in a day Patients who require high protein diets are encouraged to drink 600-800 mL of milk a day. Now, you must be wondering how one can consu
What is scientific investigation?
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