Protanopia caused by an unequal recombination in the gen passed on from the parents to their children. Patients with protanopia, either have faulty long-wavelength cones (L-cones). The latter of protanopia is called red-dichromacy.
In other source, they are wrote definition about protanopia :
Protanopia: The limited ability to see all primary colors to seeing blue and yellow.
Protanopia: lowered sensitivity dichromacy characterized to long wavelengths of light resulting in limited capability to distinguish red and purplish blue.
Different types of Red-green color blindness splitted by two: Whereas those affected by protan color blindness have limited ability to sensitive red light, deuteranopia or deuteranomaly (other type of red-green color blindness) have related to sensitive on green light.
Gender Protanopia Protanomaly
Male 1.01% 1.08%
Female 0.02% 0.03%
Ratios by Gender