. Genetics in relation to agriculture. Livestock; Heredity; Variation (Biology); Plant breeding. PLANT-BREEDING METHODS 423 A system of labeling and recording that will be at once concise and definitely descriptive of the individuals and the nature of the matings has obvious advantages. Pearl has devised a system which is especially useful in crossbreeding experiments and in work with self-sterile plants; it can be adapted for any material. By the use of letters to denote indi- viduals or types of individuals that are brothers and sisters and numbers to denote types of matings a perfectly gene
. Genetics in relation to agriculture. Livestock; Heredity; Variation (Biology); Plant breeding. PLANT-BREEDING METHODS 423 A system of labeling and recording that will be at once concise and definitely descriptive of the individuals and the nature of the matings has obvious advantages. Pearl has devised a system which is especially useful in crossbreeding experiments and in work with self-sterile plants; it can be adapted for any material. By the use of letters to denote indi- viduals or types of individuals that are brothers and sisters and numbers to denote types of matings a perfectly general set of terms is provided R I *. F, i-r-i^^<HYi C D E F C Types of Mating in F2 F2 indi- Number f 2 indi- Number F, indi- Number F-i indi- Number viduals of viduals of viduals of viduals of mated mating mated mating mated mating mated mating A XX 10 BXZ' 46 C XF 51 EXE 19 AXY 12 B X B 13 C X G 53 E XF 45 A X Z 40 B XC 37 D XX 22 E XG 47 A X Z' 42 B X D 29 D XY 24 F XX 30 A X A 11 B X E 55 D XZ 52 F XY 32 A X B 33 B XF 57 D XZ' 54 F XZ 60 Axe 25 B XG 59 D X D 17 F XZ' 62 A X D 35 C XX 18 DXE 43 F XF 21 AXE 61 C X F 20 D XF 31 F XG 49 A XF 63 C XZ 48 D XG 27 G X X 34 A XG 65 C XZ' 50 E X X 26 G X Y 36 B XX 14 C XC 15 E XY 28 G X Z 64 B XY 16 C X D 39 E X Z 56 G XZ' 66 BXZ 44 C X E 41 E XZ' 58 G XG 23 Fig. 172, Table LVI.—Illustrating a system of labelling Fi and fz individuals resulting from any type of mating. (Adapted from Pearl.) Order of precedence: female named first in every cross; JT 9 X YcP — mating (1); Y9 XXtf = mating (10; in back-crosses Zater generation $ X earKcr generation o^ ranks first, thus Z9 X Xcf = mating (2), X9 X Z<f = mating (20, etc. Digitized by Microsoft®. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Babcock, E. B. (Ernest Brown), b. 1877; Clausen, Roy Elwood, 1891-.
Size: 1771px × 1410px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksu, booksubjectplantbreeding
