Human and mouse cells are treated with red and green fluorescent dyes respectively and are made to fuse. The resultant cells are kept at ${37}^{o}C$. The distribution of dye on the surface of the cells will be

The correct option is D
When human and mouse cells are treated with red and green dyes respectively, the membrane of the human cell will receive red color while that of the mouse cell will receive green color. When the two cells are fused and kept at ${37}^{o}C$, there will be movement of lipids along the fused membrane. So, in the new membrane the two dyes will be mixed up.