Final answer:
A person with the LeLe HH SeSe AA genotype would have type A antigens and other substances modified by the Lewis and secretor genes present in their saliva, due to the expression of those alleles.
Step-by-step explanation:
The question about what substances would be present in the saliva of a person with the LeLe HH SeSe AA genotype touches on human genetics and blood group antigen secretions. This genotype suggests that the individual possesses two copies each of the Le, H, Se, and A genes. The Le (Lewis gene) and Se (secretor gene) alleles encode for enzymes that modify the type of carbohydrates expressed on the surface of cells and in bodily fluids like saliva, while the H gene interacts with these to produce the H substance that is the precursor for A and B antigens in blood types. The AA genotype indicates this individual has type A blood. Given this genotype, the person would secrete type A antigens and other substances modified by the Lewis and secretor genes in their saliva.