Rose question please help 4 homework........?

supose a plant breeder has a thornless rose bush with scentless pink flowers ,a thorny rose bush with sweet-smalling flowers ,and a thorny rose bush with scentless purple flowers\





How might the plant breeder develop a purebred variety of thornless sweet-smelling purple roses???????????











please help


best help gets best answer................................

Rose question please help 4 homework........?
OK:





1. Thornless, pink, scentless


2. Thorny, unknown color, sweet


3. Thorny, purple, scentless





Cross 2 x 3 and their thorny, purple, sweet-smelling progeny repeatedly until a thorny, purple, sweet-smelling rose is obtained which breeds true (gives only thorny, purple, sweet-smelling progeny). Do the same for 1 x 2 until you get thornless, pink, sweet-smelling.





Then cross these two pure-breeding hybrids until you get a purebred thornless, sweet-smelling purple rose.