-12 



THEORY OF EVOLUTION 



garden plant called four o'clock (Mirabilis jal- 

 apa) with red flowers is crossed to one having 

 white flowers, the offspring are pink (fig. 13). 

 The hybrid, then, is intermediate in the color of 



^%S 



PARENTS 



Fig. 13. Diagram illustrating a cross between a red (dark^ \ 

 and a white variety of four o'clock (Mirabilis jalapa). ) 



its flowers between the two parents. If these 

 hybrids are inbred the offsj^ring are white, pin! 

 and red, in the proportion of 1:2:1. All oi 

 these had the same ancestry, yet they are oj 

 three different kinds. If we did not know theii 



