We study the oscillation, the stability, and the global attractivity o
f the simple genotype selection model y(n+1) = y(n)e(beta(1-2y(n-k))/1
-y(n) + y(n)e(beta(1-2y(n-k)), n = 0, 1, ..., where beta is-an-element
-of (0, infinity) and k is-an-element-of {0, 1, 2, ...}.