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Question 1. When the mean value of variation is selected against, ____ selection results.

disruptive

directional

stabilizing

no

Question 2. Punctuated equilibrium refers to:

slow, steady evolution of a small isolated population

rapid and continuous evolution of a population

rapid evolution of a population followed by periods of little change

none of these

Question 3. Special mating plumage produced by birds during a time of year is an example of:

a reproductive isolating mechanism

winter coloration to blend into the background

as aspect of aging of the birds as they become old and senile

none of these

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Question 2: 
slow, steady evolution of a small isolated population

This evolutionary theory suggests that a species slowly and continuously evolved over a long period of time. This selection and variation happens more gradually. It is hard to notice over a short period of time. The change is slow, constant and consistent. In punctuated equilibrium, the changes come in spurts. There are periods wherein a huge change occurs and there are also periods with very little change. The mutation is at random. Genetic drift is the change in the frequency of a gene variant due to a random sampling of organisms. 

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