looking for any ideas on sex and breeds

[JAE1974]

Hello all. I am wondering if anybody has any ideas on the sex and breeds of my 3-4 week old chicks. I received them at while taking a class at a local Ag Extension class and was told the eggs were gathered from several local contributors and some are likely mixed-bred. Any thoughts would be appreciated.

 

[Mel281]

The black one on the far right looks like a boy to me. His comb is quite red compared to say the gray one in front.
Those are the only two I can really see. We might need some better pictures.

 

[Gray Farms]

Much to early still. Very good chance they are crossbreds. Most "classroom" chicks are.