Table 1.
Cases of homozygous recessive traits in male and female subjects
| Males | Females | |||||
|---|---|---|---|---|---|---|
| HRT (frequencies) | Controls n = 170 (%) |
SBO n = 42 (%) |
SBA n =23 (%) |
Controls n = 200 (%) |
SBO n = 53 (%) |
SBA n = 28 (%) |
| Blond hair | 35 (20.6) | 16 (38.1) | 10 (43.5) | 42 (21.0) | 19 (35.9) | 12 (42.9) |
| Straight hair | 92 (54.1) | 31 (73.8) | 17 (73.9) | 98 (49.0) | 36 (67.9) | 15 (53.6) |
| Two hair whorls | 21 (12.4) | 4 (9.5) | 1 (4.3) | 21 (10.5) | 3 (5.7) | 1 (3.6) |
| Opposite hair whorl orientation | 44 (25.9) | 1 (2.4) | 3 (13.0) | 25 (12.5) | 8 (15.1) | 6 (21.4) |
| Soft hair | 60 (35.3) | 23 (54.8) | 10 (43.5) | 91 (45.5) | 28 (52.8) | 20 (71.4) |
| Continuous hairline | 53 (31.2) | 14 (33.3) | 13 (56.5) | 89 (44.5) | 29 (54.7) | 9 (32.1) |
| Attached ear lobe | 31 (18.2) | 3 (7.1) | 1 (4.3) | 51 (25.5) | 7 (13.2) | 4 (14.3) |
| Ear without the Darwinian notch | 21 (12.4) | 2 (4.8) | 4 (17.4) | 16 (8.0) | 3 (5.7) | 1 (3.6) |
| Blue eyes | 39 (22.9) | 15 (35.7) | 8 (34.8) | 48 (24.0) | 15 (28.3) | 15 (53.6) |
| Color blindness | 8 (4.7) | 1 (2.4) | 2 (8.7) | 4 (2.0) | 1 (1.9) | 0 (0.0) |
| Right thumb over left thumb | 82 (48.2) | 14 (33.3) | 10 (43.5) | 86 (43.0) | 22 (41.5) | 7 (25.0) |
| Top joint of the thumb >45° | 67 (39.4) | 13 (31.0) | 8 (34.8) | 62 (31.0) | 26 (49.1) | 6 (21.4) |
| Proximal thumb extensibility | 20 (11.8) | 10 (23.8) | 3 (13.0) | 37 (18.5) | 11 (20.8) | 10 (35.7) |
| Left handedness | 32 (18.8) | 8 (19.0) | 4 (17.4) | 19 (9.5) | 11 (20.8) | 6 (21.4) |
| Index finger longer than the ring finger | 58 (34.1) | 18 (42.9) | 5 (21.7) | 103 (51.5) | 29 (54.7) | 13 (46.4) |