How is an egg urged to develop int an embryo in cloning technology

After the donor DNA is introduced into an egg cell that had its nucleus removed, scientists use an electrical current to fuse the DNA with the empty egg.

As an alternative, certain chemicals can be used to mimic the effects of fertilization caused by the entry of a sperm cell.  

white blood cells or wbc s are mainly 2 types-

1.agranulocytes

2.granulocytes

the monocytes or macrophages of agranulocytes , dendritic cells which are accessory leucocytes, and b cells which is one type of lymphocytes   identify the antigens present on the pathogen's surface. these three cells are called antigen presenting cells(apc) which are phagocytes and destroy the antigens by secreting antitoxins. besides this leukocyte is always plays vital role in the immunity of the body.