Answer:
<h2>Both Yy</h2>
Explanation:
1. As  given here, 
Total offspring are= 124;
that produce yellow squash= 93;
that  produce green squash= 31;
2. Let Y  for yellow producing squash and y for green squash;
Y is dominant over y.
3. Cross between two yellow squash producing plants 
Genotype of parents = Yy and Yy
offspring = YY, Yy, Yy and yy,
as Y is dominant over y, so YY and Yy all produce yellow squash, and yy  produce green squash.
4. Their phenotypic ratio is 3:1 , as in question 93: 31