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Principles of Plant Genetics and Breeding

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54 CHAPTER 3<br />

Part A<br />

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

Outcomes assessment<br />

1 A whole organism can be raised by nurturing a single cell.<br />

2 The diploid chromosome number has half the number <strong>of</strong> chromosomes in the gametic cell.<br />

3 Mitosis produces identical daughter cells.<br />

4 A heterozygote has identical alleles <strong>of</strong> a gene at the locus.<br />

5 Thymine occurs in DNA but not in RNA.<br />

Part B<br />

Please answer the following questions:<br />

1 The four nucleic acids <strong>of</strong> DNA are …………., ……………., ……………, <strong>and</strong> …………. .<br />

2 Distinguish between DNA <strong>and</strong> RNA molecules.<br />

3 Discuss the levels <strong>of</strong> organization <strong>of</strong> eukaryotes.<br />

4 In plants DNA occur in the nucleus, ……………, <strong>and</strong> …………….. .<br />

5 A nucleic acid consists <strong>of</strong> a base, ……………, <strong>and</strong> ………………… .<br />

6 Define epistasis.<br />

7 What is an mRNA?<br />

8 Give the three basic types <strong>of</strong> tissue <strong>and</strong> distinguish among them.<br />

Part C<br />

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

1 Discuss the laws <strong>of</strong> Mendel.<br />

2 Discuss the use <strong>of</strong> a testcross in plant breeding.<br />

3 Discuss genetic linkage <strong>and</strong> its importance in plant breeding.<br />

4 Distinguish between the phenomenon <strong>of</strong> variable gene penetrance <strong>and</strong> variable gene expressivity.<br />

5 Discuss the regulation <strong>of</strong> gene expression.

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