384 INTRODUCTION TO EVOLUTION 



Fig. 17.3 pictures meiosis in a heterozygous, black female hamster, 

 which inherited the gene M from its mother, the gene m from its father. 

 In the figure the paternal "long chromatids" with gene in are shown as 



OOGONIA 

 (many mitoses) 



PRIMARY OOCYTE 

 (shown at metaphase) 



SECONDARY OOCYTE 

 and 1st POLAR BODY 



OVUM and 

 2nd POLAR BODY 



FIG. 17.3. Meiosis (oogenesis) in the female. 



passing into the secondary oocyte, the maternal "long chromatids" with 

 gene M as being discarded in the first polar body. The result is that the 

 ovum shown contains m. But the fate of the chromosomes when the pri- 



