An Increase in the Expression of the Gene For $\beta$ -Catenin in Transgenic Mice Produces A(n)
A) Smooth Cortex

An increase in the expression of the gene for $\beta$ -catenin in transgenic mice produces a(n)

A) smooth cortex.
B) highly folded cortex.
C) increase in the size of the frontal cortex.
D) decrease in the size of the frontal cortex.