What is the purpose of the Control Probe? Suppose you are a genetic counsellor and perform the FISH test on a newborn child. What is your interpretation if (1) The karyotype shows binding of both the control and elastin probes to only one chromosome, or (2) the karyotype shows binding only of the elastin probe, (a) to one chromosome only, or (b) two both chromosomes, or (3) The karyotype does not show binding of either the control or elastin probes.