MENDELISM AND MUTATION 



341 



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

 distribution shown by the characters in Mendel's experiments : two groups 



PARENTS 



FIG. 132. Mendelian inheritance in black and albino guinea pigs. 



FIG. 133. Chromosome history in the cross represented in Fig. 132, showing the 

 parallelism between the distribution of a single homologous pair of chromosomes and that 

 of a single allelomorphic pair of Mendelian characters. 



of (factors for) characters are brought together at fertilization and are 

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



