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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.
Degree of dispersion of protein solution is decreased. It is decreased because of certain reasons:- Association: refers to changes occuring at subunit or molecular leve
Define the Interaction of Vitamin C with other Nutrients? Having gone through the discussion above it must be evident to you that nutrients are interdependent and are related t
Q. Which chemical elements are involved to form most of living biological matter? The chemical elements that form most of the molecules of living beings are carbon (C), oxygen
Cotyledon is a leaf-like structure which is present in the seeds of the flowering plants; it appears during seed germination and sometimes is referred to as the seed leaf.
An account of characters of mollusca
Contraceptive methods The safe and easy methods to prevent pregnancy are called contraceptive methods. i) Contraceptive methods followed by females are : 1) Use of harmon
Q. Etiologic factor of dyslipidemia? The causative factors of dyslipidemia/hyperlipidemia may be environmental (dietary/ lifestyle), genetic or secondary to certain disease con
How many alleles of genes that condition X-linked traits do female and male individuals respectively present? For every correspondent gene to an X- linked trait women present a
Explain the Life History of Lycophytes? Lycophytes have two separate and distinct generations in their life history that alternate with each other. The gametophyte stage is tin
Nitrogen Fixation Nitrogen is an essential constituent of living organisms and there is an inexhaustible supply of it in the atmosphere in the free form. Majority of living o
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