INTRODUCTION TO PLANT BREEDING

AGRONOMY 815 / CLASS ASSIGNMENTS


P. STEPHEN BAENZIGER, 338 Keim Hall, 472-1538

DEPARTMENT OF AGRONOMY / UNIVERSITY OF NEBRASKA



PROBLEM SET 5Due October 23, 1997


Name: ________________________________________________________________________




  1. You have crossed an insect resistant plant to an insect susceptible plant. Assume insect resistance is controlled by one gene:


    How would you breed an insect resistant line using the bulk breeding method?






    How would you breed an insect resistant line using the single seed descent method?









    What would change in the bulk breeding and single seed descent method if the insect resistance were controlled by 10 genes?









  2. You have identified a DNA marker that is 10 map units from a gene of interest. You want to back cross the gene of interest in by selecting for the marker. After 6 backcrosses where you select only for the DNA marker, what are your chances that you have a line that contains the marker but not the gene of interest?








    3. How would your answer change if the marker were 5 map units or 25 map units from the gene of interest?