Correct spelling for the English word "geneticses" is [d͡ʒˈɛnɪtˌɪksɪz], [dʒˈɛnɪtˌɪksɪz], [dʒ_ˈɛ_n_ɪ_t_ˌɪ_k_s_ɪ_z] (IPA phonetic alphabet).
The word "geneticses" does not have an established etymology because it is not a recognized English word. It seems to be a non-standard or made-up term that may have been derived from "genetics" (the study of genes and heredity), by adding the plural suffix "-es". However, this is not a correct way to form the plural form of "genetics" in English. The correct plural form would simply be "genetics".