After studying medium ground finch families from year to year, the Grants determined that beak size (length and depth) was highly heritable. This is primarily due to

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Beak size being highly heritable in medium ground finches, as determined by the Grants, is primarily due to additive alleles. Additive alleles contribute to the variation in traits such as beak size by the cumulative effect of multiple genes, making the trait highly heritable and subject to natural selection.

After Studying Medium Ground Finch Families from Year to Year