. Elementary biology; an introduction to the science of life . 8'9 10 11 12 13 14 15 16 17118'19 20 2122 Fig. 2-V7- Two-peaked curve of 237- variation The height of the line above the base corresponds to the number of daisy heads {CInysantJieynztrn segetiirn) hav- ing the number of ray-florets indi- cated at the bottom. The solid line shows that there were many heads with 13 florets, and very many with 21, and that the intermediate num- bers were represented by fewer indi- viduals, as were also the numbers above 21 and the numbers below 13. The broken line shows the distribu- tion of the follo
. Elementary biology; an introduction to the science of life . 8'9 10 11 12 13 14 15 16 17118'19 20 2122 Fig. 2-V7- Two-peaked curve of 237- variation The height of the line above the base corresponds to the number of daisy heads {CInysantJieynztrn segetiirn) hav- ing the number of ray-florets indi- cated at the bottom. The solid line shows that there were many heads with 13 florets, and very many with 21, and that the intermediate num- bers were represented by fewer indi- viduals, as were also the numbers above 21 and the numbers below 13. The broken line shows the distribu- tion of the following year's crop, grown from seeds out of 13-ray heads. Note the greatly increased proportion of 13-ray heads
Size: 1535px × 3257px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, bookpublishe, booksubjectbiology
