Paul S. answered 03/11/22
Professional Tutor. Online Expert. SAT Math and Science. All Levels.
In a simple Mendelian cross, each trait in inherited independently of any other (Law of Independent Assortment). So for each:
Aa x aa --> Aa and aa (1:1)
Bb x bb --> Bb and bb (1:1)
Cc x cc --> Cc and cc (1:1)
All together by multiplying all the individual outcomes:
(Aa , aa) x (Bb, bb) x (Cc, cc) =
(AaBb, Aabb, aaBb, aabb) x (Cc, cc) =
(AaBbCc, AabbCc, aaBbCc, aabbCc, AaBbcc, Aabbcc, aaBbcc, aabbcc) all (1:1:1:1:1:1:1:1) ratio.