7. X- linked recessive inheritance.
| a. | is associated with haemophilia. | |
| b. | is associated with congenital cardiac defects. | |
| c. | is associated with Duchenne muscular dystrophy. | |
| d. | is associated with testicular feminisation syndrome. | |
| e. | is associated with Turner syndrome. | |
| f. | sons of carrier mothers have a 50% risk of being carriers | |
| g. | sons of affected fathers have no risk of the disease | |
| h. | daughters of carrier mothers have a 25% risk of the disease | |
| i. | daughters of carrier mothers have a 25% risk of being carriers. |