gastrulation - 2025 ACF Regionals

Question

A 1955 study of this process by Townes and Holtfreter demonstrated that it can happen spontaneously to minimize free energy in the differential adhesion hypothesis. For 10 points each:

[10m] Name this process controlled in one organism by dpp and inhibited by Sog. During this process, the marginal zone undergoes convergent extension and involutes the blastoral lip.

ANSWER: gastrulation [accept short gastrulation; prompt on morphogenesis or embryogenesis or embryonic development]

[10e] Dpp and Sog control dorsal-axis formation in this model insect popularized by Thomas Hunt Morgan.

ANSWER: fruit fly [or Drosophila melanogaster or D. melanogaster]

[10h] Anterior–posterior axis patterning in Drosophila is determined by maternal effect genes like this protein that patterns the head and thorax with Hunchback. The first discovered morphogen was this protein, which when mutated causes a lethal phenotype in which the insect develops a longer abdomen instead of its head.

ANSWER: Bicoid [or bcd; accept homeotic protein bicoid]

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Summary


Florida	2025-02-01	Y	3	10.00	100%	0%	0%
Great Lakes	2025-02-01	Y	6	11.67	100%	17%	0%
Lower Mid-Atlantic	2025-02-01	Y	6	16.67	100%	50%	17%
Midwest	2025-02-01	Y	6	15.00	100%	50%	0%
North	2025-02-01	Y	3	13.33	100%	33%	0%
Northeast	2025-02-01	Y	5	16.00	100%	40%	20%
Overflow	2025-02-01	Y	4	12.50	100%	25%	0%
Pacific Northwest	2025-02-01	Y	2	15.00	100%	50%	0%
South Central	2025-02-01	Y	2	10.00	100%	0%	0%
Southeast	2025-02-01	Y	4	17.50	100%	50%	25%
Upper Mid-Atlantic	2025-02-01	Y	9	13.33	100%	22%	11%
Upstate NY	2025-02-01	Y	3	10.00	67%	33%	0%

Data


Florida A	Valencia A	0	10	0	10
Florida State A	UCF B	0	10	0	10
Florida B	UCF C	0	10	0	10
Michigan A	Carnegie Mellon A	10	10	0	20
Carnegie Mellon B	Michigan C	0	10	0	10
Ohio State B	Michigan D	0	10	0	10
Michigan State	Michigan B	0	10	0	10
Ohio State A	Case Western A	0	10	0	10
Duke	Liberty A	10	10	10	30
South Carolina	Liberty B	10	10	0	20
William & Mary	UNC B	0	10	0	10
Virginia Tech A	UNC C	10	10	0	20
Virginia A	UNC D	0	10	0	10
Liberty C	Wake Forest	0	10	0	10
Chicago B	Illinois B	10	10	0	20
Illinois A	Chicago C	10	10	0	20
Chicago D	Chicago A	0	10	0	10
Missouri	Illinois C	0	10	0	10
WashU A	Indiana B	10	10	0	20
Indiana A	WashU B	0	10	0	10
Carleton	Iowa State	0	10	0	10
Minnesota B	Winona State	0	10	0	10
Wisconsin A	Wisconsin B	10	10	0	20
Case Western B	Kenyon	0	10	0	10
BU	Brandeis A	0	10	0	10
Harvard A	Brandeis B	0	10	0	10
Harvard B	Dartmouth A	0	10	0	10
Brown A	Tufts A	10	10	0	20
MIT A	UMass Boston	10	10	10	30
Northwestern B	Georgetown A	0	10	0	10
Notre Dame C	Notre Dame B	0	10	0	10
Purdue	Iowa	10	10	0	20
Stanford B	Northwestern A	0	10	0	10
UW B	Alberta	0	10	0	10
UBC	UW A	10	10	0	20
Texas B	ASU	0	10	0	10
TAMU	Texas A	0	10	0	10
Georgia Tech A	Tennessee A	10	10	10	30
Georgia Tech C	Louisville A	10	10	0	20
Georgia Tech B	Vanderbilt A	0	10	0	10
Alabama A	Bruin A	0	10	0	10
NYU A	Cornell B	0	10	0	10
George Washington A	Haverford B	0	10	0	10
John Jay College	Columbia C	0	10	0	10
Maryland A	Johns Hopkins A	0	10	0	10
NYU B	George Washington B	0	10	0	10
Penn B	Haverford A	10	10	0	20
Rutgers A	Penn A	0	10	10	20
Vassar A	Maryland B	0	10	0	10
Yale A	Columbia B	10	10	0	20
Cornell C	Binghamton A	10	10	0	20
RIT A	Cornell D	0	10	0	10
RIT B	ESF A	0	0	0	0