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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.
EVIDENCES OF EVOLUTION - The evidences of organic evolution derived from many lines of study indicate that present day forms have arisen by gradual changes from pre existing fo
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
What is the mathematical expression of the genetic equilibrium for genes with two alleles? Is this statistical distribution the same as the statistical distribution of the respecti
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Define Prevention of vitamin A deficiency? Since dietary inadequacy is the major cause for micronutrient deficiencies, the most rational approach to prevent these deficiencies
Relative to carrying capacity, what may result from unbridled continued growth of our population.
Define cause of vitamin a deficiency - Poverty and ignorance? Low purchasing power of the communities and their consequent inability to meet the nutrient requirements and tradi
Define Nutritional Requirements and Recommended Allowances for Proteins and Amino Acids? The FAO/WHO Committee (1973) expressed the protein requirements in terms of egg or milk
Q How different are extracellular and intracellular digestion? What is the evolutionary advantage of extracellular digestion? Intracellular digestion is that in which the break
write short notes on sex limited traits.
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