I am generally confused as to of what you are asking. Can you post something so i can see what you need? I just am confused.
Bacteria! Bacteria! Bacteria! :)
This is called incomplete dominance. When an something is heterozygous for an incomplete dominant gene, the resulting phenotype will be somewhere between the two. For example if a plant has a tall allele and a short one, but neither shows complete dominance over the other, the plant height will be somewhere in the middle.
Answer:
the answer would be a mutation during reduction division
Because then the doctor needs to know if the cancer is very harmful and if he can cure it