Which term describes the type of trait that is usually expressed only when an organism has two identical alleles for a trait

Cells destroy body cells infected by a virus or bacteria.

The vaccine in a flu shot contains weakened flu viruses. how does a flu shot work with the immune system? a. it destroys lymphocytes. b. it destroys macrophages. c. it activates macrophages. d. it activates lymphocytes.

Where can dna be found in a prokaryotic cell