If a rooster lays one brown egg and one white egg,what kind of chicks will hatch?

1) Roosters don't lay eggs. 2) Brown eggs and white eggs both produce hens and roosters, the only difference between a white egg and a brown egg is that the brown egg come from hens with red feathers and earlobes (yes they have earlobes). More information can be found here: http://www.straightdope.com/columns/read/2103/whats-the-difference-between-white-eggs-and-brown-eggs

and 3) You missed a space between "egg," and "what" just so you know.

Roosters are not capable of laying eggs.