6. When populations are small, gene frequencies can change from generation to generation and some alleles may become fixed in a population. This is called __________ .

A. assortative mating
B. inbreeding
C. heterosis
D. genetic drift

7. Which of the following is correct in terms of the determination of the location of genetic traits?

A. Known protein-coding sequences are too far apart to allow linkage determination for most new genes
B. Restriction sites allow DNAs to be digested
C. Protein-coding genes are always associated with a restriction pattern
D. None of the above

8. In gel electrophoresis, DNA molecules migrate from __________ to __________ ends of the gel.

A. negative … positive
B. basic … acidic
C. long … short
D. positive to negative

9. Restriction enzymes

A. protect bacteria from viral infection
B. cut DNA in a staggered fashion
C. cut DNAs producing a blunt end
D. all of the above

10. First discovered, Type II restriction endonuclease was

A. Hinf I
B. Eco K
C. Hind II
D. EcoRI