Packet 11: Bonus 7
The SHOX gene is often stated to be able to “escape” this process. For 10 points each:
[10m] Name this epigenetic process that culminates in the formation of Barr bodies enriched with the macroH2A histone variant. This process is regulated by competing T·six and Xist (“exist”) long non-coding RNAs.
ANSWER: X-inactivation [or X-chromosome inactivation or lyonization; accept answers indicating one X chromosome is being inactivated; prompt on gene silencing; prompt on gene inactivation]
[10h] The SHOX gene can escape X-inactivation since its copies are located on these genetic regions. Inheritance of genes located on these telomeric regions of the X and Y chromosomes is typically not fully sex linked.
ANSWER: pseudoautosomal regions [or PARs; accept pseudoautosomal region 1 or PAR1; accept pseudoautosomal region 2 or PAR2]
[10e] Another pseudoautosomal gene, A·S·M·T, encodes for a methyl·transferase that converts N·A·S to this hormone. The pineal gland secretes this hormone to trigger the onset of sleep.
ANSWER: melatonin [reject “melanin”]
<KN, Biology> | NAFTA-Packet-11
| Heard | PPB | E % | M % | H % |
|---|---|---|---|---|
| 1 | 10.00 | 100% | 0% | 0% |
Conversion
| Team | Opponent | Part 1 | Part 2 | Part 3 | Total | Parts |
|---|---|---|---|---|---|---|
| Strange Case of Dr. Joker and Mr. Pennywise | You Don't Have the Cards | 0 | 0 | 10 | 10 | E |
Summary
| Tournament | Edition | Match | Heard | PPB | E % | M % | H % |
|---|---|---|---|---|---|---|---|
| 2025 NAFTA Online | 02/14/2026 | ✕ | 4 | 15.00 | 100% | 50% | 0% |
| 2026 NAFTA at Vanderbilt | 02/14/2026 | ✕ | 1 | 20.00 | 100% | 100% | 0% |
| 2025 NAFTA at Toronto | 09/13/2025 | ✓ | 1 | 10.00 | 100% | 0% | 0% |
| 2025 NAFTA at Maryland | 09/27/2025 | ✕ | 1 | 20.00 | 100% | 100% | 0% |
| 2025 NAFTA at Chicago | 11/08/2025 | ✕ | 6 | 18.33 | 100% | 67% | 17% |