Final answer:
Genetics research shows that races are similar under a microscope by comparing DNA or cDNA through microarray analysis. People have genetically similar maps and gene expression contributes to observable traits called phenotypes.
Step-by-step explanation:
Genetics research reveals that under the microscope, the races are remarkably alike. This is because on a genetic level, the DNA of all human beings is incredibly similar. For example, individual genetic maps in a given species are genetically similar, with a majority of the DNA sequence being identical across individuals of the same species. Moreover, the observable traits expressed by an organism, which are known as its phenotype, are a result of the specific combination of inherited genes reflecting both genetic variance and environmental influences. Additionally, microarray analysis is a technique used in genomics to compare two samples of genomic DNA or cDNA, demonstrating the use of advanced tools in genetics to understand and compare our genetic makeup.