Can boys carry hemophilia but not have it?

Yes, boys can be carriers of hemophilia but not have the disorder themselves. Hemophilia is an X-linked recessive genetic disorder, meaning that the gene responsible for the disorder is located on the X chromosome. Males have one X chromosome and one Y chromosome, while females have two X chromosomes.

For a male to have hemophilia, he must inherit two copies of the hemophilia gene, one from each parent. However, if a male inherits only one copy of the hemophilia gene, he will be a carrier of the disorder. This means that he will not have hemophilia himself, but he can pass the gene on to his daughters.

Daughters of a male carrier of hemophilia have a 50% chance of being carriers themselves, and a 50% chance of being unaffected. Sons of a male carrier of hemophilia will not be affected by hemophilia, but they can be carriers.