Final answer:
A person with the genetic makeup Hh, AO, LeLe, sese will have A, H, and Leb antigens in their secretions, as these are the antigens coded by the expressed alleles.
Step-by-step explanation:
If a person has the genetic makeup Hh, AO, LeLe, sese, the substances found in their secretions would be determined by the genes that are expressed for these traits. The H gene codes for the H antigen, which is the precursor to A and B antigens in blood types, and because the person has at least one dominant H allele (Hh), they will express the H antigen. Since they also have the AO genotype, it indicates that they have one A allele, and since A is dominant over O, the A antigen will be expressed. Therefore, both A and H antigens will be found in their secretions.
The LeLe genotype signifies that the person has two copies of the Lewis gene that leads to the expression of the Leb antigen. Finally, sese indicates that they do not produce the Se antigen, which would convert Leb into Lea. As a result, substance Leb will be present in their secretions, not Lea. Hence, the substances found in the person's secretions would be A, H, and Leb antigens.