HEREDITY AND SEX 



237 



that is, new coinbimitions nvv iiuulc. kind, that is any kind but white, can 



The exhibit in the American Museum occur only when certain members of two 



showing inheritance of flower color in of these pairs come together. One of 



sweet peas, is complicated 1)\- the fact the white parents had one of these char- 



tliat not only arc there three pairs of acters and the other had the second; 



characters, but also that color of any union by crossing gave colored offspring. 



From erhibil in the American 

 Museum of Natural History 

 INHERITANCE OF THREE PAIRS OF CHARACTERS 

 \\ here three pairs of characters are concerned in a cross there will be eight classes of individuals in the second 

 generation of offspring. The pairs of characters concerned above are black and cream-colored, yellow and cream- 

 colored, and self-colored and hooded (the condition in which all pigmentation is concentrated near the head). 

 Black, yellow and self-colored are the dominants. The eight classes of offspring (of which only samples are shown) 

 are: black-yellow-self (gray), black-yellow-hooded (white with gray hood), black-cream-self (black), black-cream- 

 hooded (black hood), cream-yellow-self (yellow), cream-yellow-hooded (yellow hood), cream-cream-self (cream) 

 and cream-cream-hooded (cream hood) 



