The question bring the gollowing data:
Color of the seed: YY, Yy to yellow seed and yy to green seed;
Plant height: TT, Tt to tall vine and tt to short vine;
To know the probability for short yellow seed plants the Punnett Square for this phenotype from the crossing of parent plants (in this case heterozygotes for the trait).
For this dihybrid cross between to heterozygote plants the question brings the follow probability:
Thera are sixteen possible genotypes combinations between the two characteristics:
For Tall with yellow seed: 9/16
For Tall with green seed: 3/16
For Short with yellow seed: 3/16
For Short with green seed: 1/16
The probability for yellow seed offspring is: 12/16
The probability for short vine offspring is: 4/16