A true breeding swan flower plant with smooth petals is crossedwith a true breeding swan flower plant with constricted petals. Theoffspring of this cross all have smooth petals. This indicatesthat
1) the offspring do not have a constricted allele in theirgenotype
2) smooth petals are dominant and constricted petals arerecessive
3)constricted and smooth petals are not controlled byalleles
4) the F2 generation will have all smooth petals
5) constricted petals are dominant and smooth are recessive
