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Principles of Plant Genetics and Breeding

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350 CHAPTER 18<br />

Part A<br />

Please answer the following questions true or false:<br />

Outcomes assessment<br />

1 Hybrid vigor is highest in a cross between two identical parents.<br />

2 CMS may be used in hybrid breeding to eliminate emasculation.<br />

3 The inbred A-line is male-sterile.<br />

4 G. H. Shull proposed the dominance theory <strong>of</strong> heterosis.<br />

5 A hybrid cultivar is the F 1 <strong>of</strong>fspring <strong>of</strong> a cross between inbred lines.<br />

Part B<br />

Please answer the following questions:<br />

1 Define a hybrid cultivar.<br />

2 What is hybrid vigor, <strong>and</strong> what is its importance in hybrid breeding?<br />

3 What is an inbred line?<br />

4 What is a heterotic group?<br />

5 Explain the dominance <strong>of</strong> single-cross hybrids in modern corn hybrid production.<br />

Part C<br />

Please write a brief essay on each <strong>of</strong> the following topics:<br />

1 Discuss the dominance theory <strong>of</strong> heterosis.<br />

2 Discuss the importance <strong>of</strong> synchronization <strong>of</strong> flowering in hybrid breeding.<br />

3 Discuss inbred lines <strong>and</strong> their use in hybrid breeding.<br />

4 Discuss the contributions <strong>of</strong> G. H. Shull <strong>and</strong> D. F. Jones in hybrid breeding.

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