First, life replicates itself for the most part in the same manner in all organisms. Second, DNA is the molecule of heredity. DNA provides life its bl ueprints for building, replicating and surviving. Humans have a wide variety of DNA sequences, but the majority of sequences are common to all humans. DNA condenses to form chromosomes.
Gene interaction controls the physical and structural characteristics of organisms.
Allelic pairs make up genes. Interactions between different types of alleles create different genotypes, which is expres sed by different phenotypes. The process of mapping of the complete human chromosome is called the human genome project. The information gained by the sequencing of the human chromosome can be compared and contrasted with the DNA sequences of individual s that posses a certain trait. This will allow scientist to determine which gene or sets of genes control a trait.