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Darwin put fort the notion of the survival of the fittest. How do we define 'fittest'? The answer usually given is those who survive. So you can readily see that this is a circular agrument and doesn't really help us understand what really happens following natural selection quite clearly. The idea of fitness as a matter of survival will not do. Therefore in the course of the development of what we have earlier referred to as the modern synthesis the notion of fitness was related to the ability of the individual to maximise the number of progeny left in the next generation. In other words the notion of fitness was translated into reproductive success. Given the idea of fitness as being measurable in terms of reproductive success we can now go back to basic tenets of Darwinism. The first of the five observations mentioned therein was the tendency on the part of living organisms to reproduce: In an exponential manner. We noted that the consequence of this is competition for available resources which results in "the survival of the fittest" Clearly, therefore. in3terms of reproductive ability nature is truly prodigal.
Q. What is the physiological cause of the syndrome Called as cretinism? Cretinism is caused by chronic deficiency of the thyroid hormones (T4and T3) during childhood. The chron
Admission to the Hospital The philosophy of childcare, whether in the home, hospital, or other community agency, should be consistently one of concern and support for the
Progressive senescence - Senescence This is the third category of senescence. Here also the leaves are shed but it is gradual senescence of leaves up the stem. For example, th
The Deoxyribonucleic acid or also called as DNA molecules are informational molecules encoding the genetic instructions used in the functioning and development of all known living
Both these neurotransmitter strengthen memory when they are released into the blood stream following learning. Stressful events stimulate release of stress hormones from the adrena
Which of the following best describes the role that restriction enzymes play in bacteria? A. Restriction enzymes recognize and digest bacteriophage genomes after an initial inf
What is the autotrophic hypothesis on the origin of life? An autotrophic hypothesis on the origin of life asserts that the first living beings on earth were producers of their
Point out some Difference between Tumor And Cancer? Tumor is a swelling or growth because of an abnormal growth of tissue. Tumors can either be benign or malignant. The benign
PHYSICAL STATE OF PROTOPLASM Several theories have been given about its physical structure - (i ) Granular Theory (Proposed by Altman, Hanstein, 1886) - Granules embed
Difference between Vegetative and Generative Cell The cytoplasm of the vegetative cell and the generative cell is distinctly different. The generative cell is transparent and
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