K Barrett wrote:
Scientists sequenced the genome of the honeybee.

http://www.sciencenews.org/articles/20061028/fob1.asp

In this article the reporter writes "Among the novelties of the honeybee,
Apis mellifera, are its 170 genes for odor receptors."

(snip)

But if this is the first time a species' genome has been looked at and if
there are only 5 other insects that have had their genome cracked, much less
studied, then 'How do they know?"

By comparison with known odor receptor genes in fruit flies, Drosophila
melanogaster. It doesn't actually matter how many insects have had
their genomes sequenced. What matters is that fruitflies have been
sequenced, AND their genes have been mutated to see what they do.