In blind cave fish,eyes do not form.However,transplantation of the lens from a closely-related aboveground fish into the optic cup of the cave fish induces eye development.What does this suggest about the loss of vision in the cave fish?
A)Primary induction of the eye fails in the cave fish because the lens lacks some critical signal.
B)Secondary induction of the eye fails in the cave fish because the lens lacks some critical signal.
C)Primary induction of the eye fails in the cave fish because the optic cup lacks the ability to receive some critical signal.
D)Secondary induction of the eye fails in the cave fish because the optic cup lacks the ability to receive some critical signal.

Question

Quizplus · Accepted Answer

The transplantation experiment suggests that the lens from the aboveground fish contains a necessary signal for eye development that the cave fish lens lacks. This indicates that the process of secondary induction (where one tissue influences the development of another) is failing in the cave fish due to the absence of a critical signal from the lens, not because the optic cup cannot receive the signal.

In Blind Cave Fish,eyes Do Not Form