Answer :

The gene responsible for beak size in finches is the calmodulin-binding protein (LCAMB) gene. This gene encodes a protein involved in the regulation of bone growth and development in the face and beak region.

The expression of the LCAMB gene affects beak size by influencing the rate of bone growth during embryonic development.

Specifically, variation in the expression of this gene can result in changes in the shape and size of the beak, leading to differences in feeding behavior and food use.

For example, higher expression of LCAMB results in longer and deeper beaks, which are better suited for consuming hard seeds, while lower expression leads to shorter, broader beaks, which are better adapted for consuming soft fruits and flowers.

Therefore, changes in the expression of LCAMB can drive beak size variation in the Galápagos finches and affect their ability to adapt to different food sources.

To know more about calmodulin refer here :-

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