1. Chapter 6 and 7
Review

4. Which of the following methods do scientists use to locate genes on chromosomes?
(a) gene strategy (b) gene linking (c) gene recombining (d) gene mapping

5. Because X and Y chromosomes are not homologous, most of the genes on the X chromosome
are homozygous
do not match the Y chromosome
Are not expressed
do match the Y chromosome

6. b

7. By 1952, geneticists Martha Chase and Alfred Hershey had confirmed that the
molecule of heredity was
(a) saliva (b) DNA (c) protein (d) bacteria

8. b

9. The possible genotypes for a bald woman are
(a) BB (b) Bb (c) bb (d) Bb & bb

10. a

11. A carrier of hemophilia (a) cannot have children (b) is homozygous for the hemophilia allele (c) carries a recessive trait that is not expressed (d) has hemophilia

12. c

13. Which of the following is not one of the nitrogen bases in DNA (a) adenine (b) guanine (c) uracil (d) thymine

14. c

15. A color-blind female and a male with normal vision have a child
A color-blind female and a male with normal vision have a child. What can be predicted about the offspring? (a) all males will be color-blind (b) all males will be carriers (c) all males will have normal vision (d) all females will be color-blind

16. a

17. Baldness is a (a) sex-linked trait (b) sex-limited trait (c) sex- influenced trait (d) sexy trait that all people wish they had

18. c

19. Chargaff’s rule states that in DNA, the amount of adenine equals the amount of (a) guanine and thymine (b) cytosine (c) guanine (d) thymine

20. d

21. When Griffith mixed live R bacteria with dead S bacteria, the live bacteria took on the traits of the dead bacteria. What did he conclude?
genetic material was transferred
proteins are recessive
fertilization had occured

22. a

23. The failure of chromosomes to separate correctly during cell division is
(a) Karyotype (b) nondisjunction (c) sex-limited (d) incredibly bad luck

24. b

25. Sex-linked traits are normally carried on the
(a) X chromosome (b) Y chromosome (c) 21st chromosome (d) O chromosome

26. a

27. Process by which DNA copies itself

28. replication

29. The basic unit of DNA

30. Nucleotide

31. When nondisjunction occurs in all chromosome pairs.

32. polypoidy

33. Traits that are found on the X chromosomes

34. Sex-Linked

35. Having only one copy of a chromosome

36. Monosomy

37. The base that pairs with cytosine

38. guanine

39. The expression of the trait is caused by hormones

40. Sex influenced

41. Why are sex linked traits expressed more often on males than females

42. Extra words to know Karyotype Sex-limited trait Trisomy Autosomes
Double helix

43. Explain the difference between sex-linked traits, sex-limited traits and sex-influenced traits.

44. Draw a model of DNA with at least 5 rungs labeling the sugar, phosphates, hydrogens, purines and pyrimidines.

45. What is the human genome project

46. The three steps to DNA replication