Slide showing figure 72: 'Scheme illustrating inheritance of weight in a cross between Sebright bantam [female] and Gold-penciled Hamburgh [male].' Slide shows figure 72: 'Scheme illustrating inheritance of weight in a cross between Sebright bantam [female] and Gold-penciled Hamburgh [male].' Explanatory text below the diagram reads: 'Figure 72. - Scheme illustrating inheritance of weight in a cross between Sebright bantam [female] and Gold-penciled Hamburgh [male]. The figures at the top indicate weight in grams. The [two females]] of the parental and F1 generations are weighted, i.e., their actual weights are X 5/4 to bring them into line with those of the [two males]. In F2 the weights of the [two males] alone are given. (From Punnett, Heredity in Poultry, copyright by Macmillan and Company Ltd., 1923. Reprinted by permission.' Late 19th to early 20th century