What is the ratio of heterozygous offspring to total offspring in the punnett square

What are the genotypes of the parents?  if the parents are homozygous recessive, and homozygous dominant( like TT and tt)
it would be:
  T    T
t[Tt][Tt]
t[Tt][Tt]  Which would make heterozygous(Tt)  100%

HOWEVER,  if BOTH parents are homozygous dominant, or homozygous recessive(TT, or tt)

like so
   T   T
T[TT][TT]
T[TT][TT]  none would be heterozygous.

if both parents are heterozygous(Tt)(which I'm guessing is the case)
   T     t
T[TT][Tt]
t [Tt][tt]  Than your percentage would be 50%  (2:4 ratio) 

IF you could specify the genotype, that would be great.