Problem 5. The drawings in Figure 5 represent two different chromosomes in three

Question

Problem 5. The drawings in Figure 5 represent two different chromosomes in three hybrid lines of fruit flies. Both homologs of each of the chromosome are shown. The solid chromosomes and dark centromeres are homologous. The dotted chromosomes and light centromeres are homologous. The lower case letters indicate recessive alleles. Refer to this figure as you consider the questions below. 25) Which hybrid line is heterozygous for a pericentric inversion? a) hybrid line1 b) hybrid line 2 c) hybrid line 3 d) hybrid lines 1 and 2 Done of the above 26) Which hybrid line is heterozygous for a translocation? a) hybrid line 1 b) hybrid line 2 nybrid line 3 d) hybrid lines 1 and 2 e) none of the above 27) Which hybrid line is heterozygous for a paracentric inversion? a) hybrid line 1 b) hybrid line 2 c) hybrid line 3 ybrid lines 1 and 2 e) none of the above 28) Which of the following will create dicentric and acentric recombinant chromosomes? a) A crossover between the E and F genes in hybrid line 1 b) A crossover between the E and F genes in hybrid line 2 c) A crossover between the E and F genes in hybrid line 3 d) A crossover between the E and F genes in hybrid lines 1 and in hybrid line 2 e) none of the above 29) Which hybrid line will have males fruit flies with reduced fertility compared to a wild type males? a) hybrid line 1 b) hybrid line 2 hybrid line 3 d) hybrid lines 1 and 2 e) none of the above 30) Which hybrid line will produce recombinant gametes that contain duplications and deletions if a two-strand double crossover occurs, with one crossover between the E and Fgenes and one crossover between the Fand G genes? a) hybrid line 1 b) hybrid line 2 c) hybrid line 3 d) hybrid lines 1 and 2 one of the above

Explanation / Answer

25. (e) none of the above. None of the hybrid lines show a pericentric inversion.

26. (c) hybrdi line 3. Hybrid line 3 shows a translocation (exchange of chromosomal segments or chromosomal rearrangements between two nonhomologous chromosomes is called translocation)

27. (d) hybrid lines 1 and 2. Both the hybrid lines have inversion of the chromosomal regions; hybrid line 1 has a paracentric inversion that involved the genes d e f g, whereas the hybrid line 2 has inversion for the genes e f g h

28. (d) Dicentric chromosomes have two centromeres on the same chromosome; acentric chromosomes lack the centromere.

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