{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Genetics Exam 3_key

Genetics Exam 3_key - BioSc 231 General Genetics Exam 3...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
BioSc 231 General Genetics Exam 3 Name __________________________________ Multiple Choice. (2 points each) __C __ Recombination frequencies ___ A. are the same for all genes. B. arise from specific genetic exchange. C. are the same for cis and trans heterozygotes. D. decrease with distance. __ B __ A plant of genotype C/C;d/d is crossed to c/c;D/D and an F1 testcrossed to c/c;d/d. If the genes are linked and 40 map units apart, the percentage of c/c;d/d recombinants will be A. 10% B. 20% C. 30% D. 40% E. 50% __ C __ The maximum recombination frequency between two genes is A. 100% B. 80% C. 50% D. 10% E. 1% __ B __ In Drosophila, the two genes w and sn are X-linked and 25 map units apart. A female fly of genotype w + sn + / w sn is crossed to a male from a wild-type line. What percentage of male progeny will be w + sn ? A. 0 B. 12.5% C. 25% D. 37.5% E. 50% __ C __ The maize genes sh and bz are linked, 40 map units apart. If a plant sh + bz / sh bz + is selfed, what proportion of the progeny will be sh bz / sh bz ? A. 0.04 B. 0.10 C. 0.20 D. 0.40 __ A __ In maize, two plants that are both heterozygous for the recessive alleles a and b are crossed. What frequency of double- mutant progeny will appear if a and b are 7.2 map units apart and both parents carry a and b in trans? A. 0.036 B. 0.0625 C. 0.001296 D. 0.005184 E. 0.072 __ D __ In crossing over A. Genetic exchange occurs before chromosome replication B. The probability of its occurrence decreases with increasing distance between the genes exchanged C. Occurs between two loci very close together D. The reciprocal exchange between homologous chromosomes is random
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
__ A __ The F , G and H loci are linked in the order written. There are 30 map units between F and G , and 30 map units between G and H . If a plant F G h / f g H is testcrossed, what proportion of the progeny plants will be f g h / f g h if there is complete interference? A. 0.15 B. 0.21 C. 0.245 D. 0.3 E. 0.7 __ C __ Out of 800 progeny of a three-point testcross there were 24 double crossover recombinants, whereas 30 had been expected on the basis of no interference. The interference is A. 0.05 B. 0.10 C. 0.20 D. 0.50 E. 0.80 __ B
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern