How is it possible to obtain the probability of emergence of a given genotype formed of more than one pair of different alleles with independent segregation from the knowledge of the parental genotypes?

Taking as an example the crossing of aaBBCc with AaBbCc, for every considered pair of allele it is possible to verify which genotypes it can form (as in an independent analysis) and in which proportion. AA x aa: Aa, aa (1:1). Bb x BB: BB, Bb (1:1). Cc x Cc: CC, Cc, cc (1:2:1). The genotype to which the probability is decided on determined is for instance aaBbcc. For every pair of this genotype the formation probability is determined: to aa, 0.5; to Bb, 0.5; to cc, 0.25. The final result is acquired by multiplication of these partial probabilities, 0.5 x 0.5 x, 0.5, resulting 0.0625.