Humans have 23 different chromosome pairs. E.g. the Pea plant. Recombination - A chromosome pair not only separates into single strands when forming gametes during meiosis, but it also exchanges sections of each strand back and forth during meiosis. We call this process crossing over. Every organism has two copies of its genome in its chromosomes.
Alleles can be recessive, dominant, and codominant.
Codominance means that when you have different alleles in your gene pair, aspects of both alleles are expressed. DNA is deoxyribonucleic acid - double helix. The sequence of the nucleotides is the basis of genetic information. The Expression of Genetic Information DNA contains a sequence of nucleotides. Every 3 nucleotides is called a codon.