What is the genotype of a man with a short chin, if it is known that a long chin in a person is a dominant trait?

A genotype is a collection of genes that an organism receives from its parents. In the cells of the body, the set of chromosomes is double or diploid, that is, each chromosome has a paired one, which means that each gene is represented by a pair – an allele.
If a long chin in a person is a dominant feature (A), then the genotype can be AA or Aa. The trait, determined by the recessive gene, manifests itself only in a homozygous state, that is, the genotype of a man with a short chin (a) will be – aa.