GenCh15answers - Large-Scale Chromosomal Changes 1. 2. MM N...

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Large-Scale Chromosomal Changes 1. MM N OO would be classified as 2 n –1; MM NN OO would be classified as 2 n ; and MMM NN PP would be classified as 2 n +1. 2. It would more likely be an autopolyploid. To make sure it was polyploid, you would need to microscopically examine stained chromosomes from mitotically dividing cells and count the chromosome number. 3. Aneuploid. Trisomic refers to three copies of one chromosome. Triploid refers to three copies of all chromosomes. 5. No. Amphidiploid means “doubled diploid.” Because cauliflower has n = 9 chromosome, it could not have arose in this fashion. It has, however, contributed to other amphidiploid species. 9. Cells destined to become pollen grains can be induced by cold treatment to grow into embryoids. These embryoids can then be grown on agar to form monoploid plantlets. 11. Yes. You would expect that one-sixth of the gametes would be a . Also, two-sixths would be A , two-sixths would be Aa , and one-sixth would be AA . 12. Both XXY and XXX would be fertile. XO (Turner) and XXY (Klinefelter) are both sterile. 13. Older mothers have an elevated risk of having a child with Down syndrome and other non-disjunctional events. 14. No. The DNA backbone has strict 5´ to 3´ polarity, and 5´ ends can only be joined to 3´ ends. 15.
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This note was uploaded on 09/25/2010 for the course BIOL 3301 taught by Professor Gunaratne during the Fall '05 term at University of Houston.

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GenCh15answers - Large-Scale Chromosomal Changes 1. 2. MM N...

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