Figure 7-3

FIG. 7-3a. Photomicrograph of the chromosomes from a single cell from the root tip of a double hybrid strawberry cross which produced an octoploid plant with 56 chromosomes. Slide prepared by Mr. Henry Holden at the New England Institute for Medical Research.

FIG. 7-3b. Photomicrograph of a pollen mother cell from F. vesca, a diploid plant with 14 chromosomes. This is a "squash" preparation of the second meiotic division metaphase (side view on left, polar view on right) showing the reduced number of chromosomes; i.e., 7 in each group. Slide prepared by Mr. Henry Holden at the New England Institute for Medical Research.

FIG. 7-3c. To left, the 28 chromosomes of the pollen of the variety V. Hericart de Thury; center and right, chromosomes of pollen of two varieties of the European.