The answer would be the one with the least dominant trait ( but not the one who have none)
for Example : Aa x aa
This pair of alleles will most likely to have diffrent effects on Organism ,
Aa : aa = 50 : 50
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Petrified wood is a rock that i have seen
Http://www.pbs.org/wgbh/nova/cancer/folkman.html
I believe this website will help :)