If the curve shifts to the left or to the right, there is no gene flow, and the population size consequently increases over successive generations, then which of these is (are) probably occurring?
1. immigration or emigration
2. directional selection
3. adaptation
4. genetic drift
5. disruptive selection
A) 1 only
B) 4 only
C) 2 and 3
D) 4 and 5
E) 1, 2, and 3
Ans: C) 2 and 3
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____________________ Indicate whether the statement is true or false.
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What will be an ideal response?
According to Darwin's theories and observations on "the struggle for existence", organisms better suited to an environment have a greater probability of surviving and will also:
a) lead a long, satisfying life. b) leave more offspring. c) have larger bodies. d) have fewer predators. e) be faster runners.