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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.
How are lipids used as an energy source by the organism? Carbohydrates are the major energy source for aerobic cell respiration. In the absence or deficiency of such substances
Determine the working of Law of diminishing return According to the 'Law of diminishing return' the increase in the yield by a unit increase of the defi cient factor is proport
Q. Protein Requirement during congestive cardiac failure? Protein: The protein requirements remain the &me as healthy adult men and women, About 0.8 - lg of protein per kg
Define the Proteins requirement to avoid underweight problem? Proteins are required for tissue building, as well as, to take care of the daily wear and tear. Under weight indiv
What is the function of a control group in an experiment? The function of a control group in an experiment is to be a stable to account for any effects a given environment has
Q. In which meiotic division does the separation of identical chromatids take place? And After the end of this process what are the ploidies of the new cells? The separation of
To study if bacteria grow better where it is dark or light Inoculate two sterile dishes as before. Label one 'dark' and the other 'light'. Place the 1st dish in a darkwarm plac
Limitations of Panoramic X-Ray There are certain limitations to panoramic Xrays that you have to be awareof: The amount of magnification Fine details of structures arou
Define the term - magnetoencephalography A variant ERP known as magnetoencephalography (MEG) has been developed. MEG, which is still in its infancy, requires upward of 60 elect
Explain the role of dietitian's in feeding dilemmas Usually, the dietitian's role in feeding dilemmas is seen as secondary and the physician's role is the focus. In reality,
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