Different phenos the cause?

Can anyone tell me if the yellowing shown is because of the difference in phenotypes of the plant. In the pictures you can see the 2 different phenos I got from the seeds. 1 is dark green and the other is yellowing. These are white widow seeds I got from amsterdammarijuanaseeds.com [/ATTACH]


Thanks for the help guys!

I doubt it's a phenotype. Leaves are supposed to yellow during flowering because of the reduced amount of nitrogen they are being fed. They look great! Keep it up.

damn those look sweet

Thanks man! I am still new enough to growing that ANY difference really freaks me out.

They are getting the exact same nutes and light. The difference in color is pretty drastic.