attention: science content
Scientists talk a lot about common ancestors. No reason to go into details, but one thing they all agree with, would be that insects and mammals are only very distantly related. And it should be possible to see that in the genomes of these animals.
So if we know one protein in the mouse and another one with a similiar function in the fruitfly (Drosophila melanogaster), we should expect that the honeybee has a protein that looks more like the fly protein.
But this isn't always the case. There are for example some genes responsible for circadian rhythms. Their proteins all interact in a complicated manner (if you're interested in details: you can see the paper here: it's from the Guy Bloch group) but there are certain differences between mouse and fly. And one fly protein (it's called cryptochrome) is missing in the bee. The bee has instead the mouse-like cryptochrome.
Does that disprove evolution?
As far as we know, it would.
There is no way that the honeybee is closer related to the mouse than to the fly or that it somehow stole the mouse gene, if evolution is true. Everybody who know me (and reality) a bit knows that there has to be a 'but' in this story.
And, indeed, there is a but.
What do you think the scientists did when they found this?
a) Didn't believe their eyes, had a beer or some more
b) Cried "Oh, this proves ID, Hallelujah, God is great"
c) Cried "Oh, this proves ID, let's do our best to deny it"
d) Had a closer look at the subject
Obviously a) but after they get over their headaches they continued with...any guesses?
Luckily for them, the Drosophila genome is by far not the only sequenced genome today. Apart from mice and human genomes, honey bees, bumble bees, moths, mosquitos, beetles, plants and a lot more genomes are sequenced. So it was only to compare some of them, and they found that in most insect species both the mouse-like and the drosophila-like protein are present.
What does that tell us?
First, that these genes are very old, tracing back to the common ancestor between insects and mammals.
Second, that genes can get lost during evolution (not very surprising). In this case the fly lost one of a pair of similiar proteins and the honeybee lost the other.
Third, that Drosophila might not be the ideal super model organism that fruitfly researchers always try to tell everybody. An ideal insect model organism should be a model insect, and Drosophila isn't. (But that's just me, defending myself for not working with it...)
Forth, and that's the most important one: Don't draw your conclusions too fast. And don't ignore the facts