polygenic inheritance question

[curry_bro]

hey could somebody help me with this question? its a tad fiddly and i think i may have got it wrong for that reason.

Q. COnsider the cross between the following plants.
 Plant one: +- +- +-
 Plant two: +- +- +-

a) how many kinds of gametes can each parent have?
My answer:
+++
++-
+--
---
+-+
-+-
-++
--+
so therefore, 8 variation in gametes?
b) would the offspring differ from the parents? from each other?
My answer:
as with any cross between two heterozygous organisms, the potential offspring are vary diverse and may be different from both the parents and each other. (on an actual exam/sac/test i would have mentioned the potential combinations, but dont really have the time to do so now).

Soooooooooooo, am i on the right track for this question, or am i completely wrong?

[kenhung123]

Not too sure, this might be a case of an triploidy organism so they can't produce viable gametes?
Is this the full question? What exactly does + and - indicate? A pair or homologous chromosome or alleles?
If alleles, they should have said something like the genotype of plant 1 and 2 is AaBbCc
In that case, you are right because the number of combination possible is given by 2^n