Ahmed's blood could not clot properly; he was diagnosed with hemophilia A. He passed this trait to his grandson through his:

Explanation

X chromosome of the father is only transferred to the daughter, a son takes the Y chromosome and hemophilia is an X-linked disease Ahmed, who has hemophilia A, a condition where blood does not clot properly, can pass this trait to his grandson through his daughter. Hemophilia A is an X-linked recessive disorder, meaning that the gene responsible for the condition is located on the X chromosome. Since Ahmed is the grandfather, he must pass on his X chromosome to his daughter. If his daughter inherits the affected X chromosome from Ahmed, she becomes a carrier of hemophilia A. As a carrier, she has one normal X chromosome and one affected X chromosome, but since hemophilia A is a recessive trait, she does not show symptoms of the condition. When the daughter has a child (Ahmed's grandson), she has a 50% chance of passing on the affected X chromosome to her son. If the affected X chromosome is passed on, the grandson would inherit the hemophilia A trait and potentially experience clotting problems. It's important to note that if the daughter does not pass on the affected X chromosome to her son, he will not inherit hemophilia A. However, he would still be a carrier of the condition, meaning he could potentially pass it on to his own offspring if he has children in the future.