Table 1. Adults emerging per 150 eggs of each fly type placed on each fruit type
ID: 45221 • 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. Based on these data, would you expect there to be high levels of fly migration between the two islands? Why or why not?
2. What evolutionary change (if any) in the trees does Table 1 suggest?
3. What evolutionary change (if any) in the flies does Table 1 suggest?
4. Does Table 1 provide evidence for co-evolution between the flies and the Poisontrees? Why or why not? (be concise)
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. On basis of the data we cannot expect there to be high levels of fly migration between the two islands because the survival rate of flies eggs from small island is very low (only 20 out of 150- 13.3 %) when placed on seeds from other species of trees from main island. If there was high levels of fly migration between the two islands the survival rate of eggs of migratory flies should have been significantly higher.
2. The evolutionary change in the seeds produced by poisonous trees in that they have developed high toxic effect against eggs of flies from main island.
3. The evolutionary change in the flies from small island is that they have developed resistance against the toxin produced by seeds of poisonous trees from both main and small island.
4. Coevolution is a process of evolution which alternatively induces changes in two species. Modification in one species will trigger the adaptive evolution in another species. From the data provided in table 1 we can note that the development co-evolutionary resistance against toxin have been coevolved in the flies from small island with production of poisonous seeds by trees from both main and small island but there is no appreciable resistance against seeds from other species of trees from main island.
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