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Figure 1 depicts a body cell showing the cytoplasm, nucleus and chromosomes (23 pairs per nucleated cells), with an enlargement of one of the pairs of chromosomes to show the gene loci (the positions of the genes on the chromosomes). This results in an exchange of genes between the chromosomes, that is, a new assortment of genes on each chromosome, but no new genes. From DNA to blood groups Chromosomal locations of genes encoding blood group systems The specific positioning, i.e. assignment and sub-localisation to a specific human chromosome, of the genes encoding for blood group system expression are known and illustrated in Fig. Parts of the RHCE gene can join the RHD gene and parts of RHD gene can join the RHCE gene, generating new hybrid genes. [Extracted from the article]