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Exam 2 Review Questions

Exam 2 Review Questions - ● CDEFG where ● is the...

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A. One species of diploid potato has a chromosome number of n=6, while another species has a chromosome number of n=4. Hybrids between the two species are sterile. However, rare fertile hybrid plants can be obtained. What would you expect the total number of chromosomes to be in a gamete from one of these fertile hybrids? a) 4 b) 6 c) 10 d) 12 e) 20 (See also Q. 6.5, which was accidentally not assigned.  This question is  much clearer than Q. 6.6, which I did assign by accident, and is more like  what I might ask). B.   The normal version of a chromosome has the gene order AB
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Unformatted text preview: ● CDEFG, where ● is the centromere. An inversion involving this chromosome has the gene order AB ● EDCFG. Which one of the following cross-over locations will produce a recombinant chromatid with two centromeres? (Hint: Draw the paired wild-type and inverted chromosomes, and follow the individual chromatids involved in the cross-over, like Fig. 7.26 and 7.27). a) A cross-over between A and B. b) A cross-over between D and E. c) A cross-over between F and G. d) None of the above. Answers: Q. A = c, 10 chromosomes. Q. B = b, cross-over between D and E....
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