DNA and Gene Products o pair of Diploid hetersm Cell Nucleus with two DNA 8e98rnhr8m0erna mRNA 己八n Protein If each gene is expressed then we have codominant DNA Homologous Chromosomes mRNA Protein e-anusen A gene is a portion of DNA that contains information necessary to produce a specific eation t gnee I referred to a locus. part of a protein molecule.The specific site ofd the Since we are diploid organisms the gene is represented twice and we have pairs of chromosomes.Two genes a particular locus,on matched sister chromosomes,control one particular trait for characteristic and are called alleles.In humans paired chromosomes commonly carry different alleles.If each gene is expressed,in a heterozyous situation,they are said tobe codominant and are produced In 1933 Haldane proposed that,during transplantation,an immune reaction was directed against specific allo-antigens displayed on cell membranes of the donor,A gene is a portion of DNA that contains information necessary to produce a specific protein molecule or at least, part of a protein molecule. The specific site ofd the location for any gene in a chromosome is referred to a locus. Since we are diploid organisms the gene is represented twice and we have pairs of chromosomes. Two genes a particular locus, on matched sister chromosomes, control one particular trait for characteristic and are called alleles. In humans paired chromosomes commonly carry different alleles. If each gene is expressed, in a heterozyous situation, they are said to be codominant and two different gene products ,or allo-antigens, are produced. In 1933 Haldane proposed that, during transplantation, an immune reaction was directed against specific allo-antigens displayed on cell membranes of the donor