Adults emerging per 150 eggs of each fly type placed on each fruit type (egg-to-
ID: 45325 • Letter: A
Question
Adults emerging per 150 eggs of each fly type placed on each fruit type (egg-to-adult survival)
Poisontree seeds from main island
Poisontree seeds from small island
Seeds from other species of trees from main island
Flies from main island
0
0
145
Flies from small island
140
140
20
-What evolutionary change (if any) in the trees does the Table suggest
-What evolutionary change (if any) in the flies does the Table suggest
Poisontree seeds from main island
Poisontree seeds from small island
Seeds from other species of trees from main island
Flies from main island
0
0
145
Flies from small island
140
140
20
Explanation / Answer
According to the given table, there are only poison trees in Small Island. This depicts that seeds from Main Island are dispersed to Small Island. In the beginning, the flies are unable to grow on poison tree seeds but are able to grow on other species tree seeds. Hence, other species seeds are destroyed completely leaving behind only poison tree seeds. Thus, only poison seeds are raised to form trees. The evolution of trees to form poisonous seeds allowed them to survive in Small Island.
According to the given table, the flies in Small Island have undergone evolutionary changes. Thus, they are able to grow on poison tree seeds. In contrast, the flies in Main Island are unable to grow on poison tree seeds because they have not undergone any evolutionary changes. According to survival of fittest law, the flies in Small Island are able to grow on poison tree seeds as only poison tree seeds are available in the island.
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