Individual with genotype AaBBCC has the dark skin colour.
Step-by-step explanation:
The skin colour is a polygenetic trait i.e two or more genes control the particular characteristic in an individual.
The amount of gene in the individual in such cases would determine the skin tone.
It is given that dominant alleles are responsible for darkest colour of the skin in the example. We could see that the genotype AaBBCC has maximum dominant alleles which makes us to deduce that individual with this genotype will have dark skin phenotype.
This quantitative occurrence of alleles in the individual decides its skin colour and variations in it.
The genes are independent of each other but have an additive effect on the phenotype like skin colour.