| ¼AB | ¼Ab | ¼aB | ¼ab | ||
| ¼AB | AABB(1/16) | ABAb(1/16) | ABaB(1/16) | ABab(1/16) | |
| ¼Ab | AbAB(1/16) | AbAb(1/16) | AbaB(1/16) | Abab(1/16) | |
| ¼aB | aBAB(1/16) | aBAb(1/16) | aBaB(1/16) | aBab(1/16) | |
| ¼ab | abAB(1/16) | abAb(1/16) | abaB(1/16) | abab(1/16) |
If two events are independent, the joint probability of both events is obtained by multiplying the probability of each separate event.
P(A) = P(a) = ½ = P(B) = P(b)
P(AB) = P(A) X P(B) = ½ x ½ = ¼
= P(Ab) = P(aB) = P(ab)
P(AB) = P(Ab) = P(aB) = P(ab) = ¼
P(AB + Ab +aB + ab)2 
1/16 probability for each event