| 35 | 6861 | 767 | Do. | 4562 | 767 | Do. | 1 | 0 | 3 | 25.0 | | 40_a_| 1892 | 658 | Do. | 4562 | 767 | Do. | 1 | 0 | 3 | 25.0 | | 37_a_| 2831 | 658 | Do. | 4562 | 767 | Do. | 2 | 1 |11 | 21.4 | | 36_a_| 6869 | 767 | Do. | 4562 | 767 | Do. | 1 | 0 | 4 | 20.0 | | 24 | 2526 | 658 | Do. | 3116 |D. Br. | Synd. | 5 | 0 |22 | 18.5 | | 26 | 2104 | 608 | Do. | 3116 | Do. | Do. | 3 | 0 |18 | 14.3 | | 39_a_| 4570 | 767 | Do. | 4562 | 767 | Do. | 0 | 2 |17 | 10.5 | | 27 | 2831 | 658 | Do. | 3116 |D. Br. | Do. | 3 | 0 |32 | 8.6 | | 29_a_| 190 | 520 | Do. | 3116 |D. Br. | Do. | 4 | 0 |49 | 7.6 | | 29 | 767 | 190 | Do. | 242 | 513 | Do. | 1 | 1 |28 | 6.7 | | 28_a_| 181 | 513 | Do. | 3116 | Do. | Do. | 1 | 1 |60 | 3.2 | | +---+---+---+------+ | Totals |23 | 5 |249| 10.1 | +----------------------------------------------------------------+---+---+---+------+ | RR × DR. | +------+--------+-------+-----------+--------+-------+-----------+---+---+---+------+ | 42 | 6872 | 767 |Normal. | 4562 | 767 |Normal. | 0 | 0 | 6 | 0.0 | | 41_a_| 4263 | 767 | Do. | 4562 | 767 | Do. | 0 | 0 |10 | 0.0 | | +---+---+---+------+ | Totals | 0 | 0 |16 | 0.0 | +----------------------------------------------------------------+---+---+---+------+ Summarizing the foregoing, and comparing the totals with Mendelian expectation, we get the result shown in table 25. A comparison of realization and expectation in table 25 shows that the proportion of syndactyls is always less than expectation, not only for dominants and heterozygotes together, but even for pure dominants alone. The proportion of syndactyls obtained diminishes, to be sure, in accordance with expectation (on the assumption that they are pure dominants), but the numbers lag behind, in the higher proportions 40 to 25 per cent. So we reach the conclusion that, as in polydactylism, so in syndactylism dominance is very imperfect. But there is this difference, that in syndactylism dominance is so imperfect that the dominant condition rarely shows itself in heterozygotes and even fails in many pure dominants. The striking fact, the one that assures us the segregation is nevertheless occurring in this case too, is that some families (whose two parents are extracted recessives) throw 100 per cent recessives. TABLE 25.