An experiment was performed to determine the mode of inheritance of two mouse genes, one for fur color and one for fur length. It is known that black fur (b) is dominant over white fur (b) and that long fur (l) is dominant over short fur (l). To determine how the genes are inherited, a cross was performed between two true-breeding mice, one with long black fur and one with short white fur. Their progeny, the f1 generation, all had long black fur. Five f1 male-female pairs were then crossed with one another. The f2 generation phenotypes for each cross are shown in table·1.