Answer:
It depends on the genetics of the white-flowered rose plant.
Step-by-step explanation:
If the plant is a true-breeding white-flowered rose plant (meaning it has homozygous alleles for white flowers), then its offspring will also have white flowers, as they will inherit two copies of the white-flower allele.
However, if the white-flowered rose plant is heterozygous for flower color (meaning it has one white-flower allele and one allele for a different flower color), then its offspring could have white flowers or a different color depending on the specific alleles inherited.
If the white-flowered rose plant is heterozygous, there is a 50% chance that each offspring will inherit the white-flower allele and a 50% chance they will inherit the other allele. Therefore, some of the offspring could have white flowers and others could have a different color of flowers.