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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.
Calcium deficiency (hypocalcicosis) Calcium deficiency or hypocalciosis is a sporadic condition occurring in a particular group of animals causing osteodystrophy. Aetiol
how do work in human body and animals
Tracheae - Respiration Insects that have successfully colonised the terrestrial environment have evolved a respiratory system very different from other land animals - the trac
Material Basis of Primitive Life: In the primitive society, human beings invented tools for catching animals, and for collecting, transporting and even preparing food. They l
Environment impact assessment (EIA) is a tool used for decision making regarding developmental projects and programmes and it may be defined as formal process used to predict the e
Effect of processing on mineral content of foods Minerals are comparatively stable under processing conditions such as heat, light, use of oxidizing agents and extremes in pH.
Explain about the Chromium Metabolism? Chromium appears to be absorbed throughout the small intestine, with absorption being higher in jejunum. The mechanism of absorption has
A leaf is detached from a tree and tested with iodine. The leaf turns dark blue. (a) What does this result tell you? (b) Why is this result not sufficient e
Q. Illustrate the major cells of the nervous system? The major cells of the nervous system are the neurons. as well the neurons the nervous system is also constituted of glial
Fourth Week to Eight Week - Embryonic Development The common changes in body shape and plan of the embryo from fourth week to eighth week are displayed in Figure. The fourth
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