You Are Studying Nest Building in Two Bird Species

You are studying nest building in two bird species. Species A builds a long hanging nest while species B builds a short nest that sits on top of tree branches. You interbreed the birds in the lab and then examine the nests that the offspring produce. QTL analysis shows that whether a nest is built to hang or sit is affected by a single genetic locus. The length of the nest is also determined by the same genetic locus. What can you infer about the evolution of this behavior?

A) It is a complex behavior that evolved out of a combination of two simpler behaviors.
B) It is a complex behavior where different aspects of the behavior are affected by the same set of genetic instructions.
C) It is a simple behavior that evolved out of a combination of even simpler behaviors.
D) It is a learned behavior without a genetic component.

Correct Answer:

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