Essential Genetics: A Genomics Perspective, Fourth Edition: Practice Quizzes

Bears

Title Text: Essential Genetics: A Genomics Perspective, Fourth Edition, Daniel L. Hartl and Elizabeth W. Jones

Please read each question and select your answer from the choices provided. You must complete all of the questions in order to view your results. At the end of each exam, you have the option to e-mail your results to your instructor.

1: If recombination frequency between two genes is 3 percent, what is the distance between the genes in map units on the linkage map
	A: 0.75
	B: 1.5
	C: 3
	D: 6

2: On a chromosomal map, 2 map units are equal to
	A: 4% of recombination
	B: 2% of recombination
	C: 1% of recombination
	D: 0.2% of recombination

3: The maximum recombination frequency between two genes is
	A: 100%
	B: 75%
	C: 50%
	D: 10%
	E: 1%

4: A coefficient of coincidence of 0.5 means that
	A: The frequency of double crossovers is 0.5
	B: The frequency of double crossovers is 0.5 of the number expected if there were no interference
	C: There were two times as many single crossovers as double crossovers
	D: There were two times as many single crossovers in one region as there were in an adjacent region
	E: There were two times as many parental as recombinant progeny

5: The physical exchange of segments between homologous chromosomes is called
	A: Crossing-over
	B: Synapsis
	C: Gene conversion
	D: Inreference

6: In the absence of recombination, what ratio of phenotypes is expected in the progeny of the cross AB/ab x aB/Ab?
	A: The ratio depends on the coefficient of coincidence
	B: The ratio depends on the distance between genes
	C: 9 A-B- : 3 A-bb : 3 aaB- : 1 aabb
	D: 3 A-B- : 1 aabb
	E: 1 aaB- : 2 A-B- : 1A-bb

7: In tetrad analysis 3-strand double crossing-over between two linked genes results in
	A: PD tetrad
	B: NPD tetrad
	C: TT tetrad
	D: Type of tetrad depends on the distance between genes
	E: Type of tetrad depends on the distance between genes and the centromere

8: The tendency for crossing-over to inhibit the formation of another crossover nearby is called
	A: Convesion
	B: Interference
	C: Coincidence
	D: Coupling
	E: Complementation

9: Gene conversion results from a normal DNA repair process in the cell known as
	A: Mismatch repair
	B: Postreplication repair
	C: Excision repair
	D: AP repair
	E: SOS repair

10: Genes a and b are 10.0 map units apart, and genes b and c are 20 map units apart (gene order is a ? b ? c). In the absence of interference, what is the probability of a double crossover in these regions?
	A: 20%
	B: 10%
	C: 4%
	D: 2%
	E: 1%

Optional: Enter your name and your instructor's E-mail address to have your results E-mailed to him or her.
Your Name:
Instructor's E-mail Address:
Your E-mail Address:

Jones and Bartlett Biological Sciences Home | Sign up for eUpdates | Educators: Learn more about this title

© Copyright 2006 Jones and Bartlett Publishers | Contact Technical Support