80 HEREDITY AND SEX 



cell of the Fi pink flower segregates into ''white" and 

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

 pink, and red flowers of F2. 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. 



F.3 



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 Fi, whose 

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

 give the F2 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- 



