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.