Biology

In mice, coat color is controlled by two genes:    

Gene 1: B (black, dominant) and b (brown, recessive).    

Gene 2: C (color expressed, dominant) and c (no color, recessive).    

The Punnett square below shows the inheritance of these genes in two heterozygous mice (BbCc × BbCc):        

What proportion of the offspring will be albino (no color expressed)?