Cancer is a mutation that occurs during the cell cycle, usually when it develops and grows it means the mutation was able to go through the cycle undetected at checkpoints so the cell was not destroyed by the lysosomes.
Answer:
They are know as heterozygous alleles.
Explanation:
Two IDENTICAL alleles are known as homozygous<em> </em>alleles.
I hope this helps you understand the difference, and as always, I am joyous to assist anyone at any time.