Question

I really, really need help! With respect to the experimental crosses
Mendel made, explain how Mendel insured
that homozygous tall pea plants were pure
breed. In other words, how did he insure
that all his TT pea plants were indeed all
TT and not some Tt?

Answer 1

He performed test crosses with tt plants.

What you should do to verify this is draw two Punnet squares that show the different results of TT x tt and Tt x tt.