1. A method of introgressing an allele into a soybean plant comprising: A) Providing a population of soybean plants, B) Genotyping at least one soybean plant in the population with respect to a soybean genomic nucleic acid marker selected from the group consisting of SEQ ID NO: 81, SEQ ID NO: 82, SEQ ID NO: 83, and SEQ ID NO: 84, wherein said nucleic acid markers are indicative of an allele conferring aphid resistance in a soybean plant, C) Selecting at least one soybean plant from the population based upon the presence of at least one of said genomic nucleic acid markers.