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Natural selection can therefore mean differential reproduction among members of the sarne gene pool. We earlier said that selection would promote those alleles that give rise to phenotypes that are better adapted to a given environment. In other words, the frequencies of 'such alleles would tend to increase and those of ill-adapted ones would tend to decrease. What we are sayingis that natural selection is a matter of changes in gene frequencies. Differential reproduction has a dual role to perform. One it leads to or maintains adaptations and therefore determines whether individuals of a population or species will survive; and two, it is a process which determines what changes will occur in the frequencies of alleles in a gene pool of sexually reproducing individuals.
Anaphase This phase is of shortest duration. It begins with a sudden separation of the two chromatids of each due to splitting of its centromere and then a slow mov
In E. coli there are seven rRNA transcription units scattered by the genome, each of that contains one copy of every of the 16S, 23S and 5S rRNA genes and one to four c
The cytoskeleton is a network of very little tubules and filaments spread throughout the cytoplasm of eukaryotic cells. It is made of microtubules, microfilaments and intermediate
In f e c tiou s Diseases Infectious diseases inflicts major economic losses as the disease spreads from one animal to other and large number of animals are affected with t
Q. Factors Affecting Normal Blood Sugar Levels? Earlier in our discussion, we learnt that insulin is the most important factor responsible for normal blood sugar levels. Now we
R E TIN A - It is inverted. Innermost, sensitive layer. The part of ratina which is attached to choroid is pars optica. The part of retina attached to cilliary b
Define Secondary prevention- preventive strategies for food allergy? Secondary Prevention: Attempts to inhibit expression of the disease despite sensitization. These are used f
Explain about the Paediatric and Geriatric Nutrition? Every stage has its unique requirements due to different changing needs. Adequate and optimum nutrition support is very im
In the last unit we traced the human evolutionary history mostly from a palaeontological viewpoint. Although still fragmentary, the available fossil evidence makes it possible to c
ARTERIAL SYSTEM OF MAMMAL Basic plan from origin to distribution is similar in all vertebrates as per the mode of respiration. Main anterior aorta in terrestrial forms ar
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