The answer is A, delta.
I know this because i had this on USATestPrep and got it correct :D
It binds lactose which changes its conformation so that is no longer binds to DNA. This allows the lactose operon to be transcribed.
The source is the allele for beak size being different, or more specifically the DNA sequences being different.
A person with this genetic disorder has an extra x-chromosome. Their genotype is XXY.
A) is your answer. They are know to eat many native species including small rodents, frogs, and even small snakes. Hope this satisfies your question.
