Page:Popular Science Monthly Volume 84.djvu/11

Rh

 Fig. 2. Diagram to illustrate inheritance of two pairs of Mendelian characters, viz., yellow-green and round-wrinkled peas. The 16 small squares represent the composition of the 16 F2 peas; viz., 9 YR, 3 YW, 3 GR, 1 GW.

In each animal or plant there are in general two of each kind of chromosomes. One of each kind has come from the father, one from the mother, at the time of fertilization (Fig. 3, a). A hybrid likewise