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BIO 325 - Fall 2007 - TTh 200 to 330 - I Exam - key only

BIO 325 - Fall 2007 - TTh 200 to 330 - I Exam - key only -...

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GENETICS (BIO 325) Fall 2007 T, Th 2:00 – 3:30 PM Key - I Exam 9/25/07 Total points: 100 __________________________________________________________________________________________________ 1. 1/12 2. (a) Autosomal Dominant (b) X-linked recessive 3. (a) True (b) False (c) True (d) False (e) True 4. (a) (b) 1/18 5. (a) All daughters are expected to be normal; all sons are expected to be colorblind. (b) All daughters are expected to be normal; 50% sons are expected to be colorblind. 6. 7. (a) 8 (b) 8 8. Meiosis I (1) a, (2) c, (3) b, (4) d. 9. Spools, 10 nm, coils, 30 nm, supercoil. 10. (a) 15% (b) 85% 11. (d) 12. (a) B-A-C (b) Distance between B and A is 15 m.u. and distance between A and C is 10 m.u.. 13. (a) Independent assortment ii (b) Recessive iii (c) Dihybrid cross
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Unformatted text preview: iv (d) Test cross v (e) Alleles i 14. 24% 15. (a) Trans (b) 20% 16. The human X and Y chromosomes have two homologous regions, one at each end. In being homologous these regions are autosomal-like, so they are called pseudoautosomal regions 1 and 2. One or both of these regions pair during meiosis, and undergo crossing over. In this way, the X and Y can act as a pair and segregate equally into the gametes. 17. (a) X C /X c , X c /X c (b) 1/4 18. (a) heterochromatin, euchromatin (b) The DNA is much tightly packed in the heterochromatic regions and is loosely packed in the euchromatic regions. 19. 32; increase. 20. (i) 2.57 (ii) 3 (iii) about 0.5 (iv) accept 2...
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