Individuals with the recessive trait of night blindness (genotype nn) have difficulty seeing in low light. The pedigree shows the inheritance of night blindness in a certain family. Which of these are possible genotypes of the parental generation?

disorders of the brain include both behavior disorders and other psychiatric illnesses. the primary difference between a behavior disorder and another type of psychiatric disorder is the presence of choice. psychiatric conditions are considered to be involuntary while in behavior disorders, choices are essential.

answer; during stalin"s rule, many mothers told their children that he was the greatest thing to ever happen to russia;

answer; dr.black,who allows only certain individuals to mate;