Can a man with ac genotype marry a woman with ac genotype. thank you?

Yes: I'm assuming that you are talking about the genetics of hemoglobin, so we'd be talking about individuals with a gene for hemoglobin a (normal hemoglobin) and hemoglobin c (more fragile hemoglobin). The possibilities for your offspring would be 25% aa; 50% ac; 25% cc (hemoglobin c). If you want more information, genetic counselors can talk to you at length about the possibilities.