Final answer:
When cadherin function is inhibited by antibodies in frog zygotes, cells fail to properly adhere, leading to a disorganized blastula and disrupted development.
Step-by-step explanation:
In the scenario where frog zygotes are continuously treated with antibodies that bind EP-cadherin to investigate cadherin's role in early development, you would most likely find that B) the cells associate only loosely and fail to form a properly organized blastula. Cadherins are critical for cell-cell adhesion, which is essential during the early stages of development for cells to form a structured blastula. When cadherin function is inhibited, the cells cannot adhere properly, leading to a failure in the normal organization and subsequent developmental processes. This suggests that EP-cadherin is crucial for the early stages of embryonic development in frogs.