Questions and Problems 455 



of the offspring? Is the result different from the reciprocal cross? Ex- 

 plain. 



6. It is interesting to note that kernels with waxy endosperm stain 

 red with iodine and those with the Wx gene (starchy) stain blue. The 

 wx gene also affects the pollen. Pollen grains with the wx gene stain 

 red while those with the Wx gene stain blue. What would be the color 

 of the pollen grains after staining in the plants in question 5? 



7. If the plant in question 4 were a tetraploid, what offspring would 

 be expected from the following crosses : Wwww Ssss X wwww ssss ; 

 WWww ssss X wwww SSss ; TFTFT^it; ssss X wwww ssss ? 



8. By diagraming the chromatids, show how aaaa plants could be 

 produced by the cross AAAa X aaaa if crossing over occurs between 

 the locus of a and the centromere. 



V 



