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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.
Carbon dioxide needed for photosynthesis enters the leaf via the stomata but water is also lost when these pores are open. Water is often limiting and to limit water loss through s
What is the Results of Congenital Pulmonary Stenosis? Early mortality for open pulmonary valvotomy in neonates varies between 6 and 10 per cent. For infants and children, surgi
Define the Gel Electrophoresis? Gel electrophoresis is among the most powerful and yet conveniently used methods of macromolecular separation. The gels in common use, polyacryl
Create a sketch of a petroleum trap. Write a history for how it came to the present (sketched) form following the rules of logical deduction.
who discovered it? and what is it''s physiologic functions?
Nursing Process Nursing Assessment Health history-Past-valvular, congenital or syphilitic cardiac disease/cardiac surgery. Habits-IV drug abuse. Assess the signs an
LIVE R (HEPAR) - Largest gland of body. Weighing 1.6 kg. Form 1/40 of the body weight. Bio-chemical laboratory. Bussiest part in whole river of life. Dark reddish brown
State the basic properties of Cell The differences of cell types notwithstanding, the similarities among them are more profound. Actually, all cells possess the same basic prop
What are the main conventional symbols and signs used in genetic family trees? In genetic family trees the male sex is usually shown by a square and the female by a circle. Cro
Q. Which is the extraembryonic membrane whose function is to store nitrogen wastes of the embryo? Is this function present in placental mammalian embryos? The allantois is the
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