Table 1. Summary of the four pedigrees.

Phenotype	Family 1		Family 2		Family 3		Family 4		Total
	Male	Female	Male	Female	Male	Female	Male	Female
BB	6	8	1	0	8	8	2	2	35
WG	4	5	2	3	6	3	4	3	30
N/A	1	2	0	0	2	0	0	0	5
Total	11	15	3	3	16	11	6	5	70

BB: blue-black color perception; WG: white- gold color perception; N/A: missing information.