The answer you chose is correct becAuse if both parents are heterozygous for a disease that is recessive there is a 25%chance of the offspring inheriting the trait.Ex:
R r
R (RR) (Rr)
r (Rr) (rr) rr is the only outcome that can inherit the disease.
Substitution I believe is the right answer but I never learned identity property
which of what? is there an attachment
They show which parts of the brain are involved in specific activities.