What are the stories that only science students can understand?

Once upon a time, there was a healthy boy who fell in love with a girl who was red and green blind. Despite the opposition of his family, they finally got married. The next year, the girl was pregnant, and the family's warning sounded in his ear. Color blindness is a genetic disease. The boy thought, even if my child is red and green blind, I will love him well. Finally, the child was born, a beautiful girl, and both of them were very happy.