Table 42.—Classification of the extracted hooded individuals obtained in the second generation from a cross between hooded and wild rats.
| Grade of hooded grandparents. | Grade of extracted hooded grandchildren. | Total. | Mean. | Mean, uncrossed race. | Standard deviation. | Standard deviation, uncrossed race. | |||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| -2 | -1¾ | -1½ | -1¼ | -1 | -¾ | -½ | -¼ | 0 | +¼ | ½ | ¾ | 1 | 1¼ | 1½ | 1¾ | 2 | 2¼ | 2½ | 2¾ | 3 | 3¼ | 3½ | 3¾ | ||||||
| ♀ -1⅞, gen. 2½, minus series | 2 | 4 | 6 | 5 | 6 | 13 | 2 | 1 | 3 | 4 | 5 | 3 | 4 | 2 | 1 | 1 | 62 | + .31 | -1.20 | .98 | .49 | ||||||||
| ♀♀ -2, gen. 6, minus series | 1 | 1 | 1 | 1 | 2 | 6 | 6 | 7 | 2 | 3 | 6 | 4 | 2 | 4 | 1 | 1 | 48 | + .25 | -1.59 | .97 | .44 | ||||||||
| ♀♀ -2 and -2¼, gen. 10, minus series | 1 | 3 | 3 | 1 | 10 | 3 | 9 | 8 | 14 | 4 | 7 | 8 | 1 | 4 | 3 | 5 | 2 | 4 | 1 | 91 | + .24 | -2.05 | 1.18 | .24 | |||||
| ♀♀ +3, gen. 3, plus series | 1 | 5 | 3 | 2 | 3 | 4 | 2 | 1 | 21 | +2.56 | +2.60 | .50 | .53 | ||||||||||||||||
| ♀♀ +3¼, gen. 5 and +3½, gen. 6, plus series | 1 | 2 | 1 | 1 | 1 | 6 | 9 | 8 | 8 | 1 | 38 | +2.97 | +3.14 | .52 | .49 | ||||||||||||||
| ♀ +4¼, gen. 10, plus series | 1 | 3 | 4 | 2 | 3 | 3 | 16 | +3.15 | +3.84 | .28 | .36 | ||||||||||||||||||
Table 43.—Classification of the extracted hooded individuals obtained in the second generation from a cross between hooded and Irish rats.
| Grade of hooded grandparents. | Grade of extracted hooded grandchildren. | Total. | Mean. | Mean, same grade and generation, uncrossed race. | Standard deviation. | Standard deviation, uncrossed race. | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| -2 | -1¾ | -1½ | -1¼ | -1 | -¾ | -½ | -¼ | 0 | +¼ | +½ | +¾ | +1 | 1¼ | 1½ | 1¾ | 2 | 2¼ | 2½ | 2¾ | 3 | 3¼ | ||||||
| -1½, gen. 3½ | 1 | 5 | 3 | 6 | 12 | 26 | 9 | 9 | 10 | 1 | 3 | 2 | 2 | 1 | 90 | - .62 | -1.31 | .61 | .48 | ||||||||
| -1⅞, gen. 4 | 6 | 3 | 4 | 5 | 9 | 14 | 8 | 1 | 1 | 1 | 1 | 53 | - .73 | -1.18 | .60 | .46 | |||||||||||
| +2, gen. 7½ | 6 | 6 | 12 | 11 | 8 | 3 | 4 | 4 | 6 | 1 | 3 | 1 | 1 | 66 | - .94 | -1.75 | .84 | .35 | |||||||||
| +2¼, gen. 2 | 3 | 4 | 5 | 4 | 16 | 7 | 16 | 22 | 25 | 29 | 24 | 13 | 33 | 14 | 8 | 8 | 6 | 3 | 239 | +1.27 | +1.80 | .90 | .75 | ||||
| +3, gen. 3 | 2 | 1 | 1 | 3 | 3 | 4 | 2 | 2 | 1 | 2 | 1 | 1 | 23 | + .95 | +2.50 | .87 | .53 | ||||||||||
Table 44.—F₃ generation produced by extracted hooded rats (F₂ generation) derived from a cross of a hooded rat of the minus series with a wild rat. (See Table 42.)
| Grade of (F₂) parents. | Grade of (F₃) offspring. | Totals. | Means. | Regression. | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| -1 | -¾ | -½ | -¼ | 0 | +½ | ¾ | 1 | 1¼ | 1½ | 1¾ | 2 | 2¼ | 2½ | 2¾ | 3 | 3¼ | 3½ | ||||
| ¾ | 2 | 1 | 4 | 3 | 4 | 1 | 2 | 1 | 1 | 19 | + .04 | .71 | |||||||||
| 2½ | 1 | 1 | 1 | 3 | 2 | 2 | 1 | 5 | 3 | 6 | 4 | 3 | 1 | 1 | 34 | +2.06 | .44 | ||||
Table 45.—F₄ generation from minus series crossed with wild.
| Grade of (F₃) parents. | Grade of (F₄) offspring. | Totals. | Means. | Regression. | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| -¼ | 0 | +¼ | +½ | ¾ | 1 | 1¼ | 1½ | 1¾ | 2 | 2¼ | 2½ | 2¾ | 3 | 3¼ | 3½ | ||||
| 2¼ | 2 | 1 | 1 | 3 | 6 | 6 | 9 | 16 | 25 | 14 | 10 | 2 | 1 | 96 | 1.78 | .47 | |||
| 2⅜ | 2 | 1 | 1 | 1 | 6 | 3 | 8 | 3 | 9 | 4 | 4 | 1 | 1 | 44 | 1.67 | .70 | |||
| 2⅞ | 1 | 2 | 1 | 1 | 1 | 1 | 1 | 8 | .91 | 1.96 | |||||||||
| 3 | 1 | 1 | 3 | 3 | 5 | 9 | 5 | 7 | 3 | 1 | 1 | 39 | 2.02 | .98 | |||||
| 3⅛ | 1 | 1 | 3 | 1 | 2 | 5 | 4 | 1 | 18 | 2.82 | .30 | ||||||||
| Totals or means, 2.52 | 3 | 3 | 1 | 5 | 5 | 16 | 10 | 22 | 26 | 47 | 20 | 23 | 14 | 7 | 1 | 2 | 205 | 1.86 | .66 |