1) Comparing Finches and Flies: The Hawaiian fruit flies and Darwin’s finches ha

Question

1) Comparing Finches and Flies: The Hawaiian fruit flies and Darwin’s finches have both undergone rapid speciation on islands. From the perspective of the four mechanisms of evolution mutation, genetic drift, gene flow and selection—name two reasons why speciation might proceed rapidly on groups of islands (archipelagos)?

2) Describe two ways in which the evolution of fruit flies and crickets on the Hawaiian Islands parallel each other.

3) Which Drosophila species likely diverged around 500,000 years ago (clue: this is when the island of Hawaii, aka the “Big Island” emerged from the ocean).

4)  Name at least two components of the mating display of Drosophila clavisetae.

Explanation / Answer

Ans 1) The two reasons why speciation is more rapid is group of archipelagos are:-

Ans 2) Two reasons how the evolution of fruit flies and cricket are parallel in Hawaiian Island are:-

Ans 3) The drosophila species which diverged 500, 000 years ago is the endemic species of Drosophila silvestris. It was when it was Big Island and it emerged from the sea. The diversion is due to separation of the Island into different eco-system due to natural calamity and unfavourable climatic conditions.

Ans 4) two components of the mating display of Drosophila clavisetae are pheromone bubble which is a chemical stimulant produced by male towards the female. Second component is epigamic selection which is selection by female choice.

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