The entire DNA sequence of an organism can be determined, and different organisms have many differences in sequence between them. (There are many differences even between members of the same species.) What would be the best way for geneticists to find out which DNA regions were important for a particular trait difference - for example, beak shape in Darwin's finches?

Question

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The best way to determine which DNA regions are important for a particular trait difference, such as beak shape in Darwin's finches, is to compare sequences between different finch species with different beak shapes. This allows for identification of any genetic differences that may be contributing to the observed differences in beak shape, and is a more direct comparison than comparing sequences between members of the same species with different beak shape or comparing sequences with other bird species that may not have the same level of genetic similarity.

The Entire DNA Sequence of an Organism Can Be Determined