“…Another sib‐pair linkage investigation reported that “one hundred and seventy one possible linkage relations were tested from data involving nineteen traits and 903 sib‐pairs” (Kloepfer, 1946), and an attempt to replicate previous linkage findings concluded that “no signs of linkage were found between ‘strikingly red hair’ and the blood groups ABO, MN, P, Lewis, Duffy, Kell and Rhesus, taste sensitivity to PTC., eye colour, and sex” (Hauge & Helweg‐Larsen, 1954). Another publication on allergy versus blood groups and eye color also “failed to reveal any evidence of linkage among the genes determining these traits” (Zieve et al, 1936). In those exciting times of applying the new tool of linkage analysis, it was evidently commonplace to report positive as well as negative linkage findings.…”