Please explain this probability step very detailed Im actual

Please explain this probability step very detailed. Im actually very confused as to how to even approach this problem. Thanks.

Consider this cross: AaBbCcddEeffGg x aaBbccDdeeFfGg

What is the probability of an offspring with a AaBbCcDdEeFfGg? (round to 3 decimal places)

AaBbCcddEeffGg x aaBbccDdeeFfGg

Aa*aa ----> Aa (1/2), aa (1/2)

Bb*Bb ----> BB, Bb, Bb, bb (means, 1/4th BB, 1/4th bb, 1/2 Bb)

Cc*cc ----> Cc, cc (1/2 Cc and ½ cc)

dd*Dd ----à Dd, dd (1/2 Dd, ½ dd)

Ee* ee -----à Ee, ee (means, 1/2 ee, 1/2 Ee)

ff*Ff ---à Ff (1/2), ff (1/2)

Gg*Gg --à GG (1/4), Gg (1/2), gg (1/4)

Thus, the probability of AaBbCcDdEeFfGg is, ½*1/2*1/2*1/2*1/2*1/2*1/2 = 1/128 = 0.0078