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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.
Endocrine and exocrine pancreatic cells, thyroid and parathyroid endocrine cells, adenohypophysis, adrenal and pineal endocrine cells, the lot of types of gastric exocrine and endo
Enumerate the different means of evaluating the implant prior to stage 2 surgery. The Different means for evaluating the implant prior to stage 2; i) Radiographic evaluation
Q. How different are birds and reptiles concerning the maintenance of body temperature? Are birds rare in polar regions? Reptiles are heterothermic that is they do not control
Explain about the Herbal of Valerius Cordus? The Herbal of Valerius Cordus published posthumously in 1561; contained not only medicinal plants found in Germany and Italy, but
Of which type of tissue is the heart made? How is this tissue oxygenated and nutrified? The heart is made of striated cardiac muscle tissue. The heart muscle is known as the my
Maintain nutrition Your responsibility as a nurse is to take care of nutrition and prevent the child from starvation. Breast feeding'should be continued during the diarrhoea e
Q. How can the binding of two amino acids for the peptide formation be explained? A peptide is formed when a carbon from the carboxyl group of one amino acid is connected to th
Patient Positioning The patient should be in the left lateral position as this brings the heart into contact with chest wall. The left arm is extended behind the head t
Lysosomes Lysosomes are small vesicles which are bounded by a single membrane & contain hydrolytic enzymes in the form of minute crystalline or semi crystalline granules of
What are two things that enter the cell for cellular respiration? Carbohydrate molecules and oxygen enter the cell during cellular respiration.
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