Color blindness in humans is due to the recessive gene d (D – normal vision) located on the X chromosome.

Color blindness in humans is due to the recessive gene d (D – normal vision) located on the X chromosome. The diagram shows the pedigree of a family with some members who are color blind (highlighted in black). Mark on the diagram people with normal vision who are carriers of the d gene. What are the genotypes of people designated by the numbers 1 – 13?

1.Dd
2.Dd
3.Dd/DD
4.dd
5.dd
6.Dd
7.Dd
8.Dd
9.Dd
10.dd
11.dd
12.dd
13.Dd