An earthquake hits a small island. All but a few individuals of a lizard species are eliminated in this catastrophe, and an allele is lost from the population. This is an instance of __________.
a. the bottleneck effect
b. the founder effect
c. gene flow
d. mutation
e. natural selection
Answer: a. the bottleneck effect
You might also like to view...
Four of the following might be a response to rising body temperature. Which one is the exception?
a. increased rate of breathing b. decreased secretion of certain hormones c. more sweat d. reduced blood flow to skin e. increased rate of breathing
The poor fishing off the coast of Peru
associated with El Niño is related to oceanic a. lack of typical oceanic upwellings. b. upwellings. c. thermal inversions. d. cyclonic activity. e. oxygen depletion
If a DNA sample were composed of 10% thymine, what would be the percentage of guanine?
A) 10 B) 40 C) 80 D) It is impossible to tell from the information given.
If the WER gene were expressed in every root epidermal cell, the plant would
A. greatly increase its absorptive capacity. B. strengthen its attachment to the soil. C. increase in the diameter of its roots. D. greatly reduce its ability to exchange gases at the epidermal surface. E. greatly reduce its water and nutrient uptake.