ALternating nodes

Hi guys in another post I said my plants are now over a month old and no signs of sex (yet) other than the white hairs that appear, is there any other way to determine sex before the hair appear. Someone said get a magnifying glass out whent he nodes start to alternate, what does this mean??

Thanks

Hope you can figure out the difference from the pics posted :thumbsup:.

excellent, thats explains it perfectly...have nt got alternating node just yet. thanks the the pic!

Np:thumbsup: