MENDELISM AND MUTATION 



341 



It will be recognized at once thai the above is precisely the sort of 



distribution shown by i he characters in Mendel'* 



s experiments: two groups 



PARENTS 



/ 



«k 



K Q,^l- 



Fig. 132.— Mendelian inheritance in black and albino gui 



guinea pigs. 





Fig. 133.— Chromosome history in the cross represented in Fig. L32 showing th» 



Parallehsm , twl , M1 t distribution of a single homologous pair of chr ome° M 



of a single allelomorphic pair of Mendelian characters. 



of (factors for) characters are brought together al fertilization and -ire 

 associated in the body of the offspring. When the germ cells are formed 



