GENERAL PRINCIPLES 



(Third filial generation). 



FIG. 242. Mendelian inheritance in the four-o'clock. If red (a) and white 

 (b) forms are crossed the offspring are all pink (c). These interbred yield 1/4 

 red (d), 2/4 pink (e and/), and 1/4 white (g). The lower part of the figure 

 shows the condition of the zygote and the gametes in the ancestral and first, 

 second, and third filial generations. (From Davenport after Haecker.) 



