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In the preceding block you learnt the Darwinian premise of natural selection based on certain facts and deductions thereof. You would have noticed that one of the foundations for the concept of natural selection relates to competition among the individuals belonging to the same species - the intraspecific competition. You may also recall that intraspecific competition involves two components - (1) the individuals belonging to the same species compete among themselves for thc same requisites from the eilvironment which results in physical competition, including the competition for mates and the individuals belonging to a species may compete as to which of them leaves behind a major share of descendents in the future populations. The second type of competition is more subtle, by which is meant that individuals do not compete directly or in any physical way. The success of the second type of competition is measured in terms of the survival of offsprings, and therefore alleles in the next generation. You might have by now deduced that the two types of competition are interrelated. Success in the first type of competition known as ecological intraspecific competition is a prerequisite for success in the second type of competition namely reproductive intraspecific competition. It does not mean that ecological success always ensures reproductive success, for ecologically successful individuals may be sterile; but ecological success is always necessary to achieve reproductive success. We may then summarise that intraspecific competition results in adaptations to a given environment and this helps to perpetuate the genotypes of successful individuals generation after generation.
Describe how many bones are there in human foot The human foot is a great mechanical marvel. It has 26 bones, 29 joints, and 42, various ligaments, a sensitive and protective s
Explain Starch - Tests for the Presence of Exoenzymatic Activity? Starch is a polymer of glucose linked together by glycosidic bonds. Microorganisms produce hydrolytic enzyme a
Numerous receptors have intrinsic or tightly related enzyme activity. On the required of ligand to their extracellular face like receptors undergo a conformational change and acti
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expanciate the process of oxygen and carbon dioxide exchange in sponges
Advantages Durability of these vales are long lasting. Disadvantages Need for anticoagulant therapy is life long. Risk of thrombo-embolism is hi
What are five fin fish found in the North-East United States?
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Define Iron requirements of infants? The maintenance needs for all age groups is 14 mcg/kg body weights. For infants and preschoolers, iron needs for growth and' expansion of b
Q. What are the most important worm infections? The most significant human worm infections are taeniasis, schistosomiasis, cysticercosis, ascariasis and ancylostomiasis (hookwo
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