Your biceps will be best activated by heavy, HEAVY compound movements, such as: rows, chin ups, power cleans, bench press and military press. Growth hormone is most effectively released when doing multi joint movements that incorporate a large amount of muscles in your body being used. The Bicep curls accentuate the bicep . They are not a primary mass builder. Read any of Renegaderow's threads on bulking. They should help you.
Genetics do come into play, but everyone has the genetic potential to gain some muscle. It takes the proper stimulus, training rest and diet- and if Gyno does all of this correctly, he can eventually have some amazing arms! :thumbsup: