Table 1. Adults emerging per 150 eggs of each fly type placed on each fruit type
ID: 45226 • Letter: T
Question
Table 1. 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
1. The flies from the small island appear to be less effective at utilizing species of trees other than Poisontree. What does this imply regarding the nature of adaptation in the small island flies? (be concise)
2. Describe one scenario in which the ability to survive on Poisontree seeds could lead to the evolution of a premating isolating barrier between flies from the small island and flies on the main island. (Hint: this is where you get to use your imagination, but we are looking for biologically plausible scenarios!)
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
1. In this case, few flies can utilize seeds from other species of trees; this implies these flies have structural adaptation to utilize other seeds, but still not utilizing them. This is clearly showing that flies adapted to behavioral adaptation.
2. Removal of seeds of other tree species from the main island would lead to the development of premating isolating barrier between flies from the small island and flies on the main island.
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