Question

QUESTION 23

1. Trophy-hunting is vastly different from other kinds of predation in the natural world. While natural predators usually prey on the weak and sick, human trophy-hunters target the largest and most vigorous members of a species. You are studying a population of elk that is hunted each fall, with hunters typically targeting the largest males with the largest antlers. What would you expect to observe if you tracked this population over several decades?

   		b. There would be an increase in mutations as a consequence of the hunting.
   		d. The frequency of males with large antlers would decrease over time.
   		e. Antler size would fluctuate with rainfall levels.
   		c. The frequency of males with large antlers would increase over time.
   		a. There would not be any consistent response to selection.

QUESTION 24

1. Commercial and recreational fisheries typically target the largest fish in a population. Over many generations, this will select for:

   		c. Increasing size at maturity, because only individuals that reproduce after being harvested will pass on their genes
   		a. Declining size at maturity, because only individuals that reproduce after being harvested will pass on their genes
   		e. No change in size maturity, because selectivity fluctuates through time.
   		b. Declining size at maturity, because only individuals that reproduce before being harvested will pass on their genes
   		d. Increasing size at maturity, because only individuals that reproduce before being harvested will pass on their genes

Answer 1

23) d) The frequency of males with larger antlers would decrease over time as the ones with smaller antlers escape the hunters and may reproduce to produce more elks with shorter antlers.

24)c) Fisheries target the largest fish as this will select for increasing size at maturity because only individuals that reproduce after being harvested will pass on their genes. Fisheries target large fishes allow them to breed and give rise to offsprings that are similar to their parents in size. They isolate the large fishes from the small fishes so that large fishes can be harvested.