INHERITANCE IN PARATETTIX TEXAN US 



{^ mi it 



HANCOCK 



BB 25 BC|50 CC 25 



BBIOO 



BB25 BC50 CC 25 



CCIOO 



INHERITANCE IN THE GROUSE LOCUST 



Figure 13. This photographic chart shows the inheritance of two allelomorphic char- 

 acters in the Grouse Locust {Paratctfix tcxanns Hancock). When the pure type BB is 

 crossed with another pure type CC, the resulting locusts are all of the genetic constitution 

 BC, with regard to the two characters in question. When these hybrids (the first hybrid 

 generation, or Fi of the geneticists) are inbred, three types are produced: pure BB's (25 per 

 cent), EC's, similar to those in the preceding generation ( .")0 per cent), and pure CC's (25 

 per cent). The two pure types breed true, while the hybrids (BC), when inbred give the 

 same result as in the first generation. At the upper right and upper left corners are shown 

 the results of mating a pure type with an intermediate. This chart could be used to illustrate 

 the behavior of other characters in the Grouse Locust, and of many characters in plants and 

 animals. 



