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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.
Determine the bony walls of the Maxillary sinus: The Anterior wall of the sinus has thin compact bone above the apex of the canine teeth which may extend to the lateral pirifor
Which pair of glands is affected by the hormones from the posterior pituitary? A) thyroid, ovaries B) adrenal cortex, liver C) testes, mammary glands D) kidneys, uterus
Q. Do algae reproduce asexually or sexually? There are algae that reproduce asexually, There are algae that reproduce sexually and. In unicellular algae reproduction is usually
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Why can it be said that each glucose molecule runs the Krebs cycle twice? Every glucose molecule "cycles" the Krebs cycle twice because after glycolysis each used glucose has g
What is the difference between macro and micronutrients? The categorization criterion of nutrients into macro and micronutrients has no relation to the size of the molecule. M
GREGOR JOHANN MENDEL 1. Mendel was born on 22 July 1822 at Heizendorf in Austria at Selesia village. 2. Mendel was worked in Augustion Monastry as monk at Br
Setting priorities for action: It is not enough for our actions to be coordinated with events in the outside world; they must reflect our internal needs. Pain can flood conscious
Q. What is constitutional unit of proteins? The constitutional units of proteins are the amino acids.
How different is the fish epidermis from the amphibian epidermis? The fish epidermis is very thin and having mucus-secreting cells. The fish skin does not present keratin. The
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