One more science q... i really dont understand this stuff.?

it depends on how many tall plants and how many short plants there are in the f1 breed. lets say that one parent had Tt and the other had tt, then 50% would be tall and 50% would be short. you have to do that chart thingy i learned 3 years ago in ap bio. to find the f2 genotypes just take each offsprings genotype and make a chart with a parent having that same genotype. for example if you wanted to self replicate the Tt offspring, then 75% would be tall and 25% would be short