4. We have 2 copies of each of our genes. (a) In terms of an oncogene, how many of these 2 copies need to be defective for it to cause cancer? (b) How does this contrast with tumor suppressor genes?

Which would be the outcome in a fertilized egg if the process of meiosis did not occur? twice as many chromosomes as the parents half as many chromosomes as the parents same number of chromosomes as the parents triple the number of chromosomes as the parents?

Organisms within a population must compete for resources to survive

Why is excretion necessary to maintain homeostasis?