Principles of Plant Genetics and Breeding

312 CHAPTER 16
Part A
Please answer the following questions true or false:
Outcomes assessment
1 The adapted and highly desirable parent in a backcross is the donor parent.
2 With each backcross, the progeny becomes more like the donor parent.
3 Isogenic lines differ in alleles at a specified locus.
4 A composite may consist of hybrid cultivars.
5 The donor parent is used only once in a cross in a backcross program.
6 Single-seed descent is the oldest plant breeding method.
7 Record keeping is a critical part of the pedigree selection method of breeding.
8 Nilsson-Ehle developed the mass selection procedure.
9 Bulk population breeding is suited to breeding plants that are closely spaced in commercial planting.
10 Mass selection is most effective if the trait of interest has high heritability.
Part B
Please answer the following questions:
1 ………………………….. is the adapted parent in a backcross.
2 Give a specific advantage of multiline cultivars.
3 Give a specific disadvantage of the backcross breeding method.
4 …………………………… developed the pure-line method of plant breeding.
5 Discuss a specific genetic issue involved with mass selection.
6 Give a specific disadvantage of the pedigree method of breeding.
Part C
Please write a brief essay on each of the following topics:
1 Discuss the key features of backcross breeding.
2 Discuss the application of multiline breeding.
3 Distinguish between composite breeding and multiline breeding.
4 Discuss the advantages of bulk breeding.
5 Discuss the advantages of the single-seed descent method of selection.
6 Compare and contrast the mass selection and pure-line selection methods of breeding.
7 Describe the steps involved in the mass selection method of breeding.