Agouti coat colour needs a dominant A allele, but pigment of any kind needs a dominant C allele. What is a mouse of genotype Aacc?

1. The C gene is needed for pigment production of any kind. 2. A mouse homozygous for the recessive c allele cannot make pigment and is albino. 3. That holds regardless of which allele sits at the A locus. 4. So AAcc, Aacc and aacc all give the same albino phenotype. 5. The dominant A allele in Aacc would give agouti fur only if pigment could be made at all. _Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 12 "Mendel's Experiments and Heredity", section 12.3 Laws of Inheritance_