In Blind Cave Fish,eyes Do Not Form

question 51

Multiple Choice

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.

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