Adults emerging per 150 eggs of each fly type placed on each fruit type (egg-to-
ID: 45313 • 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
-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
Egg to adult survival is greater in flies from small island than in flies from main island. The flies from small island grow on poisontree seeds as well as other seeds also, so, they can grow anywhere.
Flies from main island can grow only on main island. This is an eg. of allopatric speciation, due to geographical isolation of species. And the barrier is the poison tree seeds.
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