Introduction 83 Morphological and Molecular Approaches to Documenting
the Early History of Maize 84 Molecular Level Analysis of Archaeological Maize:
A Case Study 85 The Timing and Sequence of Selection for Key Attributes
in Maize: Combining Morphological and Molecular Evidence 90
Adenine One of the four bases that comprises DNA. Allele An allele is one of the several alternatives forms of
a gene occupying a given locus on a chromosome. Diploid A cell having two copies of each chromosome. DNA Deoxyribonucleic acid built up by the four bases
guanine, cytosine, thymine, and adenine. Gene Segment of DNA often coding for a protein. Guanine One of the four bases that comprises DNA. Heterozygous An individual is heterozygous for a partic-
ular locus when he or she carries two different alleles at this locus.