3i6 



BIOLOGY AND ITS MAKERS 



to observe the results of self-fertilization among the hybrids. 

 The hybrids were produced by removing the unripe sta- 

 mens of certain flowers and later fertilizing them by ripe 

 pollen from another pure breed having a contrasting charac- 

 ter. The results showed that only one of a pair of unit 



Fig. 95. — Gregor Mendel, 1822-1884. 

 Permission of Professor Bateson. 



characters appeared in the hybrids, while the other contrast- 

 ing character lay dormant. Thus, in crossing a yellow-seeded 

 with a green-seeded pea, the hybrid generation showed only 

 yellow seeds. The character impressing itself on the entire 

 progeny was called dominant, while the other that was held 

 in abeyance was designated recessive. That the recessive 



