Represented below is the inheritance pattern of a certain type of traits in humans. Which one of the following conditions could be an example of this pattern?
| 1. | Sickle cell anemia | 2. | Haemophilia | |
| 3. | Thalassemia | 4. | Phenylketonuria |

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A male human is heterozygous for autosomal genes A and B and is also hemizygous for hemophilic gene h. What proportion of his sperm will be ABH?
| 1. | 1/32 | 2. | 1/16 |
| 3. | 1/4 | 4. | 1/8 |