EVOLUTION
SOURCES OF VARIATION IN A POPULATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Small size makes it less likely a bull will find a mate
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A giraffe with a shorter neck is unable to reach high tree branches
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A common type of housefly develops resistance to insect poison
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A deaf leopard is unable to hear the approach of hunters
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Detailed explanation-1: -Genetics and intensive application of insecticides are responsible for the rapid development of resistance in many insects and mites. Selection by an insecticide allows some insects with resistance genes to survive and pass the resistance trait on to their offspring.
Detailed explanation-2: -Pesticide resistance is an example of natural selection because the insects who survive the initial use due to a gene that enable them to resist the attack pass on the gene for pesticide resistance to their offspring.
Detailed explanation-3: -Repeated use of the same class of pesticides to control a pest can cause undesirable changes in the gene pool of a pest leading to another form of artificial selection, pesticide resistance.
Detailed explanation-4: -Pest species evolve pesticide resistance via natural selection: the most resistant specimens survive and pass on their acquired heritable changes traits to their offspring. If a pest has resistance then the pesticide lacks efficacy – efficacy and resistance are inversely related.