Dark Cornish/White Plymouth Rock/Gender Question?

[CNJ]

Does anyone know how to tell what gender these chicks are? Not sure if a cross between a Dark Cornish rooster and White Plymouth Rock hen will produce sex links. One chick was chip monk color and the other 3 were yellowish.

 

[Painted Calls]

Pretty positive that cross wouldn't produce sex-links. It's a bit early to determine sex. Post updated pics at 6-8 weeks.

 

[CNJ]

Pretty positive that cross wouldn't produce sex-links. It's a bit early to determine sex. Post updated pics at 6-8 weeks.

They look like females to me, but act like males. I think the cross made them very active, they are more vigorous then their parents were at that age. Its interesting to note that they all seem to have similar colored pea combs. I'll post an update latter.