Once a b cell has been activated by a specific antigen (an antigen binds to an antigen receptor on the b cell membrane), it will divide, making many copies of itself. this process is known as

The answer is Clonal selection.

In a pre-existing group of lymphocytes, in this case B cells, a specific antigen activates the B cell because it bonded to a specific region of the B cell. This will induce the B cell to proliferate, producing  clones of itself, and each clone will produce antibodies. Then the antibodies will bind to the antigen making it easier for to Antigen to be eliminated.

Carbon-14 has a half-life of 5,730 years and most igneous rock is older than that.

25% or 1/4 of the offspring would have red flowers, 50% or 1/2 of the offspring would have pink flowers, and 25% or 1/4 of the offspring would have white flowers. i crossed rr and rr which are the pink-flowered genotypes to find these ratios.