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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.
Structure and Fate of Endosperm The cells of endosperm are usually thin-walled, large isodiametric and devoid of pits and store large amount of food materials. The starch alo
labelled diagram of male and female cockroach with difference between them
Which one of the following structures between two adjacent cells is an effective transport pathway? 1. Plasmodesmata 2. Plastoquinones 3. Endoplasmic reticulum 4. Plasm
Evolution of Metazoa The sponges, coming under phylum Porifera are the closest to Protista, and can perhaps be regarded even as a colony of protists rather than being multicel
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HISTORY ON CLASSIFICATION IN BIOLOGY
Explain Chronic Infections Fever Chronic Infections Fever: These are generally of longer and sustained duration. The patients have a past history of repeated episodes or con
Cumulative Interceptive Supportive Therapy (ITI Consensus report) Systematic and continuous monitoring of the periimplant tissue conditions is recommended for the diagnosis of
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