| (a) | ABO blood group | (i) | Landsteiner and Wiener |
| (b) | Rh factor | (ii) | Morgan and Castle |
| (c) | Sex linkage of Drosophila | (iii) | Landsteiner |
| (d) | Chromosomal theory of linkage | (iv) | T.H. Morgan |
| Discovery | Author | ||
| (a) | AB group | (p) | Steiner de Castell Sterli. |
| (b) | A, B and O groups | (q) | Landsteiner |
| (c) | Rh+ group | (r) | Landsteiner and Weiner |
| (d) | Sex determination in Melandrium | (s) | Wester Guard and Warnike |
| (t) | Henking and Wod Cock |