Medical Genetics 2. Human genome A genome is all the dna in an organism, including its genes. Genes carry information for making all the proteins required by all organisms These proteins determine, among other things, how the organism looks how well its body metabolizes food or fights infection, and sometimes even how it behavesMedical Genetics 2. Human Genome A genome is all the DNA in an organism, including its genes. Genes carry information for making all the proteins required by all organisms. These proteins determine, among other things, how the organism looks, how well its body metabolizes food or fights infection, and sometimes even how it behaves