Question

oncogenes are the cancer causing genes in the cells but they do not express usually.​

Answer 1

Answer:

Oncogenes (mainly proto-oncogenes) are inactive form of cancer causing genes. They are activated only when they are exposed to mutating agents ( carcinogens).

When inactive , they are responsible for other functions like protein formation, signal transduction, etc.

Hope you will be able to understand.

Answer 2

Answer:

$Oncogenes and tumor suppressors are otherwise normal genes whose expression has been changed or altered by mutation, deletion, amplification, or rearrangement, such that they contribute to the development of cancer. An oncogene is a gene that, when overexpressed, is associated with cancer.$