a) Breeders are unlikely selecting for a single central incisor in this breed, but it may appear in some individuals but not others. Such variability would be expected to occur at much reduced rates in undomesticated (wolf) populations. Name the cause that best fits the increased phenotypic variability in domesticated animals. i) Increase in assortative mating ii) Reduction in fear response iii) Reduction in developmental robustness iv) Reduction in MHC loci heterozygosity v) Aberrant X-inactivation