HOW CHARACTERS BEHAVE 153 
alone, the 50 per cent hybrids containing both dominant and recessive 
being indistinguishable from the pure dominants. 
This applies to single characters and not to entire individuals, which 
rarely are all dominant or all recessive. 
Exercise. Make some crosses in corn and then plant the crossbred seed 
and cross again with a third different color of distinct variety, as white, 
yellow, and sweet, or white, yellow, and red. 
References. 1. “ Origin of Species by Means of Natural Selection.” 
Darwin. 
2. “ Origin of Species by Mutation.” De Vries. 
3. ‘“ Mendel’s Principles of Heredity.” Bateson. 
4. “ Principles of Breeding ” (chap. xiv, sec. xii). Davenport. 
