Manoelsdorf : Defecti\'e Seeds in Maize 121 



"PURE" DEFECTIVES 



Figure 12. The lethal action of many of these defects of the endosperm is such_ that it 

 is impossible to germinate seed, much less to raise homozygous, or genetically pure defectives. 

 However, partial defectives contain enough endosperm so that it is possible to raise plants 

 from such seed. On such plants all of the seeds are defective v^^hen the ear is self- 

 pollinated or when cross pollinated with pollen from other defective plants. On the left is 

 an ear segregat'ng for partially defective grains; in the center is a self-pollinated homo- 

 zygous ear of the "partial defective," and on the right is a cross pollinated ear from such 

 a homozygous plant. 



