Rhinoviruses are transmitted through the air or via contact. We might expect this sort of transmission to require a fairly healthy host (one who gets out and comes into contact with others) and, hence, to select against virulent strains. If we take precautions and try to stay away from people or avoid any contact with people, more hand-washing stations, increased attention to sanitization, and isolation of patients will help to reduce the transmission of the disease and, in the process, may favor the evolution of less virulent strains of the virus.
Characteristic of the Vessel elements of Angiosperms
Answer:
Whale
Explanation:
Blue Whale, a bat has its things with another bat, a snake lays eggs.
Answer:
A
Explanation:
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Answer:
Increased genetic variation reduces the species chances of being extinct. Conversely, reduced genetic variation in a species increase the chances of the species being extinct.
Explanation:
With increased genetic variation in a species, there is increased phenotypic variation amongst organisms in the species for natural selection to act on with selection pressures exerted upon the species in their environment e.g. predation or diseases. Hence even if a certain genotype express susceptibility to a certain disease, only some organisms will be selected against and there are sufficient organism without this genotype that will be able to survive and ensure the continuity of the species.
Conversely, if all the organisms express the same genotype susceptible to the disease (in extreme cases), upon exposure to the disease (which acts as the selection pressure), all the organisms will die and there will be no surviving organisms for the continuity of the species. Hence with minimal genetic variation, the species is more prone to extinction due to the inability to withstand selection pressures.
This is often a common cause of concern in the conservation of endangered species. Due to the small number of e.g. tigers remaining, most offsprings are produced through inbreeding between family members thus even though the family tree of the species is expanding, there is little genetic variation within the species. Therefore, the chances of extinction of these endangered species is high and thus biologists and conservationists have to monitor the selection pressures exerted upon these species by their environment to reduce the risk of extinction.
