There are two kinds of charges - positive and negative. Negative charges, being associated with electrons, are far more mobile in materials than positive charges are. A very small excess or deficit of negative charges in a material produces noticeable electric forces. Some new gene combinations make little difference, some can produce organisms with new or perhaps enhanced capabilities, and some can be deleterious. The information passed from parents to offspring is coded in DNA molecules.
Genes are segments of DNA molecules.
Inserting, deleting, or substituting DNA segments can alter genes. An altered gene may be passed on to every cell that develops form it. The resulting features may help, harm, or have little effect on the offspring's success in the environment. Gene mutations can be caused by such things are radiation and chemicals. The similarity of human DNA sequences and the resulting similarity in cell chemistry and anatomy identify human beings as a single species.