Packet 10: Bonus 13
In 2010, Campàs et al. determined that the size of these anatomical structures positively correlated with mesenchymal (“mess-en-KYE-mul”) B·m·p·4 expression intensity. For 10 points each:
[10m] What structures did the Grants report to increase in “depth” in the progeny of survivors of a 1977 drought? It is speculated that some animals incorporate magnetite into these keratinous structures to aid in magnetoreception.
ANSWER: bird beaks [or bird bills; accept rostrum or rostra; accept beak depth]
[10e] Nestlings of a species of Darwin’s finches exhibit yellow beaks since their diet consists of the carotenoid-rich nectar of these plants. A genus of these xerophytes bears the prickly pear.
ANSWER: cactuses [or cacti; accept common cactus finch; accept prickly pear cactus or Opuntia]
[10h] High heterozygosity in beak depth alleles suggests that finch gene frequencies do not follow this effect, which occurs when the homozygosity of two subpopulations is greater than that of a random-mating combined population.
ANSWER: Wahlund effect
<MS, Biology> | NAFTA-Packet-10
| Heard | PPB | E % | M % | H % |
|---|---|---|---|---|
| 29 | 14.83 | 100% | 45% | 3% |
Conversion
Summary
| Tournament | Edition | Match | Heard | PPB | E % | M % | H % |
|---|---|---|---|---|---|---|---|
| 2026 NAFTA at Stanford | 01/17/2026 | ✓ | 4 | 17.50 | 100% | 75% | 0% |
| 2025 NAFTA Online | 02/14/2026 | ✓ | 4 | 17.50 | 100% | 75% | 0% |
| 2026 NAFTA at Vanderbilt | 02/14/2026 | ✓ | 3 | 13.33 | 100% | 33% | 0% |
| 2025 NAFTA at Toronto | 09/13/2025 | ✓ | 1 | 10.00 | 100% | 0% | 0% |
| 2025 NAFTA at Maryland | 09/27/2025 | ✓ | 1 | 30.00 | 100% | 100% | 100% |
| 2025 NAFTA at Harvard | 10/04/2025 | ✓ | 3 | 20.00 | 100% | 100% | 0% |
| 2025 NAFTA at Oxford | 10/11/2025 | ✓ | 3 | 10.00 | 100% | 0% | 0% |
| 2025 NAFTA at Chicago | 11/08/2025 | ✓ | 6 | 13.33 | 100% | 33% | 0% |
| 2025 NAFTA at Columbia | 11/08/2025 | ✓ | 4 | 10.00 | 100% | 0% | 0% |