+--------+---+--------------------------+--------------------------+-----------------------------------------+ | | | Mother. | Father. | Grade of openness in offspring. | | Serial |Pen+---+-----+------------+---+----+-----+-----------+---+----+----+----+----+---+---+---+---+--+--+ | No. |No.|No.| Gen.| Races. |Gr.| No.| Gen.| Races. |Gr.| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9|10| +--------+---+---+-----+------------+---+----+-----+-----------+---+----+----+----+----+---+---+---+---+--+--+ | 9 |727|121| P. |Dk. Brahma. | 1 | 831| P. |Houdan | 10| 9 | 11 | 6 | 6 | 2| 3| 1| 1|..|..| | 10 |735|142| P. |Mediterran. | 1 | 30| P. |Polish | 8| 4 | 1 | .. | .. | ..| ..| ..| ..|..|..| | 11 |735|177| P. | Do. | 1 | 30| P. | Do. | 8| .. | 4 | 2 | 1 | ..| ..| ..| ..|..|..| | 12 |735|198| P. | Do. | 1 | 30| P. | Do. | 8| .. | 3 | 1 | .. | ..| 1| ..| ..|..|..| | | | | | | +----+----+----+----+---+---+---+---+--+--+ | | | | | Totals (56) | ..| 13 | 19 | 9 | 7 | 2| 4| 1| 1|..|..| | | | | | Percentages | ..|23.2|34.0|16.1|12.5|3.6|7.1|1.8|1.8|..|..| | | | | | | +====+====+====+====+===+===+===+===+==+==+ |[A]12_a_|813|912| F2 |Houd × Legh.| 2 |3904| F3 |Houd × Legh.| 7| 3 | 10 | 3 | 1 | 1| ..| ..| ..|..|..| +--------+---+---+-----+------------+---+----+----+------------+---+----+----+----+----+---+---+---+---+--+--+ [A]: Extracted D × R. Table 46 gives us a picture of the nature of the dominance in this case. At first sight the narrow nostril, grades 1 and 2, including 57 per cent of the offspring, appears to be dominant. But, as later evidence shows, it is recessive. The wide nostril is dominant, but so imperfectly that only 10 per cent have a nostril above one-half open. Let us now consider the distribution of nostril form in families whose parents are hybrids of the first or later generation, crossed respectively on recessives, heterozygotes, and dominants (tables 47-49). TABLE 47.--_Distribution of frequency of the different grades of "openness" of nostril when one parent is heterozygous and the other recessive, i. e., with closed nostril (DR × R)._