1.) You buy a Sativa dominant strain.
sativas will grow to be any where between 4-8 feet.
90% of the pictures of pot plants you have most likely seen are of the variety. P.Indica which finish at between 3 feet and 5 feet.
They were making the jokes about the plant being a mother because it had missing growth all the up it.
And with that in ming it actually could be a Indica that was vegged for a long time, and kept non bushy as clones were pulled from it. Although that isnt the way tpo go for mother IMO
2.) You go the FAQ section of RIU.org and look there for info