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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.
Bronchial asthma: Bronchial asthma is characterised by bouts of dyspnoea as a result of temporary narrowing of bronchi due to bronchial spasm, mucosal edema and thick secret
Consider Neuron B in the frog central nervous system whose plasma membrane has a previously unknown channel that is selectively conductive to a newly discovered divalent cation nam
Explain the term Ageing? Ageing in human being is of a multifunctional origin and there is a programmed senescence (ageing) of the cells in the body. The genetic make-up of an
List the two primary targets to assess the good sugar control 1) There are two primary targets to assess the effectiveness of the management plan on glycemic (sugar) controls.
A large number of plants are used for bio-pesticides and bio-fertilizers. Several plant species are used as insecticides against aphids and larvae of insect pests: for insects like
Define Food Intake during Polar Expeditions? Observations made by Easty (1967) at Halley Bay, the British Antarctic survey base during 1961-62 expeditions indicate mean calorie
Q. Explain Left Atrial Enlargement ? This chamber is oval in the frontal projection and flattened in lateral projection. On the PA view, its appendage makes a small contributio
what is mean by autotrophic ?
What are the main proteins that constitute the sarcomere? What is the function of those molecules in the muscle cells? In the sarcomere there are organized myosin and actin blo
Absorption The monosaccharides, amino acids and other products of digestion must be passed on to other tissues to be useful for the organism. The process by which the digested
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