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Principles of Plant Genetics and Breeding

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7 Give a specific disadvantage <strong>of</strong> mass selection as applied to cross-pollinated species.<br />

8 What is the technique <strong>of</strong> gridding in mass selection, <strong>and</strong> what is its effect on the selection process in breeding?<br />

Part C<br />

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

BREEDING CROSS-POLLINATED SPECIES 333<br />

1 Discuss the key features <strong>of</strong> a polycross nursery.<br />

2 State <strong>and</strong> discuss the implications <strong>of</strong> Sewal Wright’s proposed formula for predicting the F 2 yield <strong>of</strong> a group <strong>of</strong> inbred lines.<br />

3 Discuss the applications <strong>of</strong> synthetic breeding.<br />

4 Compare <strong>and</strong> contrast the methods <strong>of</strong> half-sib selection with progeny test <strong>and</strong> half-sib selection with a testcross.<br />

5 Discuss the issue <strong>of</strong> heritability in recurrent selection.<br />

6 Describe the method <strong>of</strong> half-sib selection with a testcross.<br />

7 Discuss the concept <strong>of</strong> recurrent selection.

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