Chapter 22, Problem 2Q

Summary Introduction

To review:

The concentrations of the hydrocarbons in the allopatric populations when the artificial selection acts like natural selections in the experiment where the allopatric species of Drosophila serrata is bred with D. birchii.

Given:

The graph given below shows the hydrocarbon concentration in the cuticle of allopatric and sympatric species of three species of Drosophila.

Introduction:

A study was conducted on the east coast of Australia, where two species of Drosophila, D. serrata and D. birchii, coexist and breed to produce hybrids. The hydrocarbon concentration in the allopatric and sympatric species was estimated to see the differences in them. The reinforcement mechanism was assumed to be the reason for such differences in the species.