Question

*WILL MARK BRAINLIEST IF CORRECT*

Answer 1

This is all about dominant and recessive genes. According to the picture it looks like the yellow flowers have the dominant genes YY and the green flowers the recessive yy. You breeded the YY with the yy to get Yy.  Now you have a plant with the dominant and recessive gene. The green flowers are  recessive so if you breed 'y'  with anything you get yellow flowers whether they only have the'Y' gene or the both 'Y' and 'y'.