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Fruit Fly Eyeless Gene


In fruit flies, a certain gene controls the development of the eye. If this gene is inactivated, the head structure will form, but no eye will develop. If the gene is replaced with the mouse version of the fly gene, the fly will develop a normal fruit fly eye.

Which of the following is TRUE?


If the mouse version of the gene is replaced with a fly version, a mouse should develop a normal mouse eye.


The gene activates eye development but does not directly affect eye morphology.


The fly and mouse versions of this gene are homologous.


All of the above are true.