| 23rd Pair | Phenotype | Genotype | Next Generation |
|---|
| 1. XX | Normal woman | Not a carrier | No colour blindness from mother |
| 2. XY | Normal man | Normal X from mother | No colour blindness from father |
| 3. XX | Normal woman | Carrier from father | Half her children will inherit her X. The girls with her X will be carriers; the boys with her X will be colour-blind. |
| 4. XX | Normal woman | Carrier from mother | Half her children will inherit her X. The girls with her X will be carriers; the boys with her X will be colour-blind. |
| 5. XY | Colour-blind man | Inherited from mother | All his daughters will have his X. None of his sons will have his X. All his children will have normal vision, unless their mother also had an X for colour blindness. |
| 6. XX | Colour-blind woman (rare) | Inherited from both parents | Every child will have one X from her. Therefore, every son will be colour-blind. Daughters will be only carriers, unless they also inherit an X from the father, as their mother did. |