Humans use selective breeding to pass desired on to the next generation of organisms.

a.

chromosomes

c.

gametes

b.

alleles

d.

traits

How are tumors cells different from normal cells

The chromosomal structure that limits the number of cell divisions of a cell is the the chromosomal structure that limits the number of cell divisions of a cell is the kinetochore telomere histones centromere

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.