Inheritance in Gametophytes 



125 



superficial result but the process. The process may be 

 recalled for a moment. Suppose that each of the 8 

 chromosomes in a spore mother-cell contains a single 

 determiner; in such a case a nucleus can be represented 



SPORE 



MOTHER-CELL 



8 CHROMOSOMES 



lREDUCnON( 

 I DIVISION ! 



SPOROPHYTE 



INDIVIDUAL 



8 CHROMOSOMES 



CAMETOPHYTE 



INDIVIDUAL 



4 CHROMOSOMES 



ZYGOTE 



8 



CHROMOSOMES 



I FERTILIZATION I v-i 



Fig. 28. — Diagram representing life-history of a higher plant as 

 regards chromosome number. 



by fig. 29. When the reduction division occurs it 

 means that 4 of these chromosomes will go to each of 

 the two resulting nuclei. When this happens, are the 

 chromosomes chosen indiscriminately? It has been 

 learned that there is a certain limitation in the choice, 



