explain one example of an environmental factor influencing human gene expressions.; a genetic problem caused by an issue in an organism's genes; examples of environmental influences on phenotype include; a situation in which one gene influences several traits in the phenotype is __________.; what are some environmental factors that can influence gene expression; some genetic disorders are said to "skip a generation," but they are present in a parent, known as a; how does the environment affect gene expression in humans; how does the environment influence your traits give an example