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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.
role of bioenergetics in our body
Renal insufficiency Antimicrobial drugs excreted through the urinary tract may be toxic for patients with renal insufficiency if they are given in usual therapeutic doses, bec
Division of the exconjugant into daughter paramoecia: Each exconjugant, with a single micronucleus and four macronuclei divides twice and forms four daughter paramoecia. E
Q. What is the endocrine function of the placenta? The placenta is not a permanent gland of the endocrine system other than this it also has endocrinal function. The placenta p
Diarrhoeas disease: Diarrhoeas disease rank among th most leading causes of children's death in developing countries. We shall discuss two main problems in this section i.e.
Natural Gums These are derived from various plant as well as microbial sources and are divided into the following four basic categories: 1. Seaweed gums: Agar, Alginate,
This main protein component of connective tissue in mammals includes most of the organic matter of skin, bones, tendons, and teeth and occurs as fibrous inclusions in most other bo
Carbon is important constituents of all organic compounds. It forms 49% of dry weight of the organisms. Earth atmosphere contains 0.03% carbon dioxide gas. The c
how animals respiratory
Why is it important for chromosomes to be condensed during mitosis and decondensed during interphase? During mitosis the major problem to be solved is the correct separation of
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