The primary disturbance comes before Secondary disturbance. During the first stage, issue is not much given thought until it graduate into a more pressing life threatening issue which is the secondary disturbance.
Getting upset (the secondary disturbance) about initially having been upset (the primary disturbance) tends to be both pervasive and elusive. The primary disturbance occurs (or is anticipated to occur) first, then comes secondary disturbance, since chronologically it occurs second.
No it is not possible since there can be dominated or recessive alleles involved. A heterozygous for a specific gene can display the same phenotype as a homozygous for the same gene.
