Final answer:
Deficiencies in factor XI and XII are associated with prolonged bleeding times, not excessive bleeding, and are related to a form of hemophilia that affects blood clotting.
Step-by-step explanation:
Deficiencies in factor XI and XII are not usually associated with excessive bleeding or hemorrhaging but have an increased risk for prolonged bleeding times. These conditions are types of hemophilia, a group of genetic disorders that affect blood clotting. Hemophilia C, which involves a deficiency in factor XI, renders this clotting factor nonfunctional. While it is not a traditional recessive condition, even individuals with a single copy of the mutant gene can show a tendency to bleed. Treatment typically involves regular infusions of clotting factors isolated from healthy donors, and future treatments may include genetic therapy.