Question

13. Creighton and McClintock worked with homologous chromosomes physically exchange genetic information during crossing over and their model system to show that A) Peas B. Corn 14. While mapping two genes in Drosophila you observe 40 recombinants among 200 total A) 30 map units 15. Another name for a chromosome is C. Fruit flies D. Tobacco offspring. What is the distance between these genes? B. 20 map units C200 map units D. 6.67 map units , since it contains genes that are often a inherited together A) Linkage group B) Linked genes C) Autosome D) None chromosome linkage group. A) Yes B) No 16. In humans there are 22 autosomal linkage groups, plus an X and Y 17. Which of the following best defines interference? a. the suppression of recombination during mitosis b. the inhibition of one crossover by another crossover in the region c. the statistical determination of linkage d. the rate of recombination between two genes 18. In a mapping experiment with three genes, which phenotype should occur most often in the F2 offspring? A. Parental phenotypes B. Phenotypes of individuals with single crossover events C. Phenotypes of individuals with double crossover events D. All of these choices should be equal in the F2 generation 19. One map unit is equal to which of the following? b.156 ofthe chromosome 1%recombination rate a loo nucleotides c. d,1% mutation rate e, none ofthe above 20. The first genetic linkage map was constructed by a. Sturtevant b. Bridges d. Creighton and McClintock c.Bateson and Punnett e.Stern

Answer 1