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Modern Genetic Analysis Answers to Selected Problems
Chapter 2*

2. | In each cell, there are two copies of the nuclear genome (plants are diploid) and many copies of the mitochondrial and chloroplast genomes. See question

6. | The DNA double helix is held together by two types of bonds: covalent and hydrogen. Covalent bonds form within each linear strand and strongly bond the bases, sugars, and phosphate groups (both within each component and between components). Hydrogen bonds form between the two strands, between a base from one strand and a base from the other strand in complementary pairing. These hydrogen bonds are individually weak but collectively quite strong. See question

7. | If the DNA is double stranded, A = T and G = C. If T = 15%, then C = 35%. See question

10. | Human somatic cells are diploid (2n) and the haploid number is 23 (n = 23). See question

13. | 3-T A A C C G A G A-5 See question

17.

(a). 1074 base pairs;
(b). 74 base pairs;
(c). regulatory regions;
(d). 0%;
(e). 74 base pairs.
See question

18. | Introns See question

20. | (Gene size mRNA size)/number of introns = average size of introns See question

27. | 9 polytenes (each homologous pair would be joined as one) See question

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