In corn, small pollen (sp) is recessive to normal pollen (sp+) and banded necrotic tissue, called zebra necrotic (zn) , is recessive to normal tissue (zn+) .The genes that produce these phenotypes are closely linked on chromosome 10.If no crossing over occurs between these two loci, give the types of progeny expected from the following cross: 
A) sp+ zn+/sp zn; sp zn/sp zn
B) sp+ zn/sp zn; sp zn+/sp zn
C) sp+ zn+/sp+ zn+; sp+ zn+/sp zn; sp zn/sp zn
D) sp+ zn/sp+ zn; sp+ zn/sp zn+; sp zn+/sp+ zn; sp zn+/sp zn+
E) sp+ zn+/sp zn; sp+ zn/sp zn
Correct Answer:
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