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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.
What is the futile cycle The futile cycle is avoided because covalent modification, by phosphorylation, has opposite effects on the enzymes concerned with the synthesis a
Pressure and Continuity Pressure Water pressure increases with depth which varies in the ocean from 1 atmosphere where at the surface to 1000 atmosphere at the greatest
What is an example of negative feeback of the homeostatic regulation? Negative feedback happens when the response to a given action makes an effect that inhibits that action. F
What happens when the cell membrane or plasma membrane ruptures or breaks down? When cell membrane ruptures Ions leek out and if not repaired in time the cell will die. As we k
Q. What do you mean by Descending Aorta? The descending aorta begins at the level of the fourth thoracic vertebra. It is defined through the cardiac shadow on the CXR, as it l
why are they called as pisces
The vagus gives of one superior cervical cardiac branch and an inferior cervical cardiac branch in the neck. These branches descend into the thorax and take part in performing the
Why Vegetable and Fruit are important for human body? The vegetables and fruits add colour and variety to our diets in addition to providing a host of essential nutrients and p
name the sturcture formed when the male and female nuclei fuse during fertilisation.
What are some diseases caused by abnormal GH secretion by the hypophysis? In childhood deficient GH secretion might be lead to delayed growth and in severe cases to nanism (dwa
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