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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.
ime day 0 day 1 day 3 day 4 day 5 day 7 count blank 7 10 5 14 9 8 low 45&49 64&70 62&69 75&79 80&82 68&72
Rumen protection of nutrient (bypass nutrients) technology The amino acid and energy requirements of medium and high yielding cows and buffaloes are not fully met from the micr
Q. Write the meaning of diabetes mellitus? The word "diabetes" is from the Greek word meaning "a siphon". Diabetes patients had polyuria (passing excessive urine) and "pass it
difference between axon and cyton
What are the typical vegetation and the typical fauna of the tundra? Tundra has vegetation formed mainly by mosses and lichens. In the fauna the densely furred animals, like ca
During which meiosis division does ploidy reduction occur? Does ploidy reduction occur in mitosis? In the cell division by meiosis ploidy reduction occurs in meiosis II. Initia
Chloroplasts are disk-like organelles with the double membrane found in the eukaryotic plant cells; contain thylakoids and are the site of photosynthesis. ATP is generated during
Q.How is it produced and what is the function of gastrin in the digestive process? The existence of food in the stomach stimulates the secretion of gastrin that in its turn tri
how twins are produced and why
Benthic Zone - Organisation of the Marine Ecosystem The benthic zone is divisible into sub zones horizontally. These are depicted in a cross section portion of the marine habi
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