Mirror impression twins result every time a fertilized egg splits later from the embryonic stage than standard timing, around working day nine–twelve. This type of twinning could show properties with reversed asymmetry, for instance opposite dominant handedness, dental structure, or even organs (situs inversus). This is known as heteropaternal superfecundation https://easiestbookmarks.com/story20336082/the-2-minute-rule-for-twin-horizon