|The mitochondria; primary function being producing ATP energy for the cell. The mitochondria contains circular DNA which is only passed down from the mother.|
The second and far less publicized story has to do the Mary Ingalls, the sister of Laura Ingalls Wilder wrote the "Little House on the Prairie" books. The question being asked about Mary Ingalls in this investigation was why really did Mary go blind (Click for news story here) . In the books, Laura claims that Mary went blind as a result of scarlet fever. With modern medicine we know that scarlet fever rarely causes blindness and if it does the blindness is only temporary. So the idea that scarlet fever cause blindness is only a myth from the past. A medical doctor examining this went through the many letters and writings of Laura Ingalls-Wilder in order to find what illness may have actually caused Mary's blindness. In the letters, the doctor came across what appears to be Mary having spinal meningitis, which causes swelling of the central nervous system. This swelling could have easily caused damage to the optic nerves and therefore causing blindness.