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The effect of natural selection on colonies or population favouring one group in preference to other may be referred to as group selection. A group can be the smallest collection of individuals within a population or a colony. Group selection, it must be understood, is distinct from selection among individuals. The fitness of the genotypes between groups may vary within a population. The concept of altruism can be extended to groups as well. A colony consisting of many altruists has better chances of survival than a colony consisting of selfish individuals. Let us take hypothetical situatioii where individuals of a colony, reproduce indiscriminately having no regard for the carrying capacity of the environment. On the other hand, consider a colony of individuals with genes restricting population growth, utilising optimally the food sources of the environment. The selection would essentially favour the latter group and the former may eventually face extinction.
Classification of Anaemias Based on Etiology Anaemia can be classified as Impaired Production of Red Blood Cells and Hemoglobin: This can be due to nutritional def
State the term - Viral Infections A virus is an encapsulated aggregate of nucleic acid that may be made of either DNA or RNA. Some viruses, such as those causing poliomyelitis
DIFFERENCE S BETWEEN STRIATED, NON-STRIATED AND CARDIAC MUSCLE FIBRES - Striated Non-striat
Q. What is the difference between lungs and gills? Lungs and Gills are richly vascularized organs that serve for gas exchange between the environment and the circulatory system
Why do few plants adapted to a dry environment open their stomata only at night? Throughout the day in dry habitats the guard cells become the stomata close and flaccid; concur
Q. Do enzymes act better under basic or acid pH? Most enzymes act in pH between 6 and 8, a range that corresponds to the general acidic level of blood and cells. There are enzy
THEORIES OF AGEING - 1 . Compromise theory. 2 . Wear & tear theory. 3 . Somatic mutation theory. 4 . Immunity theory - Thymus becom
Endothelium - Ovule In plants bearing unitegmic ovules, the nucellus degenerates during early stages of ovule development and the embryo sac comes in contact with the innermos
example of outline f coelenterata
What is Defective Colour Vision Defective colour vision is often called colour blindness. The ability to appreciate one or more of the primary colours is lacking. This can be e
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