Answer:
8/16 or 50% is the likelihood of getting SSYy.
Explanation:
To predict the outcome of the occurrence of SSYy, let's make a punnet square:
      SY     SY     sY     sY
Sy   SSYy    SSYy   SsYy    SsYy
Sy   SSYy   SSYy   SsYy     SsYy
Sy  SSYy   SSYy    SsYy     SsYy
Sy  SSYy   SSYy   SsYy     SsYy
8/16 of the plants will have a chance of having the genotype: SSYy  This means that the there will be a 50% chance that the genotype of the offspring will be SSYy.