

80 HEREDITY AND SEX 



cell of the F\ pink flower segregates into " white" and 

 "red," which by chance combination give the white- 

 pink, and red flowers of F 2 . The white and red flowers 

 are pure ; the pink heterozygous, i.e. hybrid or mixed. 

 In this case neither red nor white dominates, so that the 

 hybrid can be distinguished from both its parents. 



PARENTS 



F 'O- *-^* 



-6 o o o 



FIG. 45. Illustrating history of gametes in cross shown in Fig. 44. A 

 white and a red bearing gamete unite to form the pink zygote in F\, whose 

 gametes, by segregation, are red and white, which by random combinations 

 give the F 2 zygotes, etc. 



Mendel tested his hypotheses in numerous ways, that 

 I need not now discuss, and found in every case that 

 the results coincided with expectation. 



THE HEREDITY OF A SEX-LINKED CHARACTER 



We are now in a position to see how Mendel's funda- 



