Predict What Would Happen If a Gene Necessary for the Expression

Predict what would happen if a gene necessary for the expression of ephrin was mutated so that it becomes non-functional.

A) Nasal axons would grow toward the rostral and caudal tectum
B) Nasal axons would only grow toward the rostral tectum only
C) Nasal axons would grow toward the caudal tectum only
D) Nasal axonal growth would be inhibited