In mice, coat color is determined by two genes:

• Gene A determines pigment color:

• A = agouti (banded hairs)
• a = black (solid color)

• Gene B controls pigment deposition:

  • B = pigment deposited
  • b = no pigment (albino)

If a mouse is homozygous recessive (bb), it will be albino regardless of the alleles at gene A.

Two heterozygous mice with genotype AaBb are crossed.

What is the expected phenotypic ratio of their offspring?