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I decided to examine the study you are talking about. It's very interesting:
51% amerindian, 25% euro and 24% African according to a study of 4,200 subjects made in 2002 for Panama.
https://ispub.com/IJBA/9/1/44045
To determine the ancestry of modern Panamanian mestizos
we analyzed 15 polymorphic short tandem repeats (STR)
autosomal markers and characterize in detail the population
genetic structure and admixture per province/regions and the
total country.Selection of Mestizos Volunteers
In Panama, most mestizo population is concentrated in the
major urban zones. We therefore collected blood samples
from about 800 unrelated mestizos (admixed) subjects from
the main cities of seven provinces in the Republic of
Panama: Panama, Colón, Coclé, Herrera, Los Santos,
Veraguas and Chiriquí.The Panama City-Colon corridor accounts for nearly 50% of Panama's population. In this study it made something like 30% of the samples combined (it seems). But seeing Panama province came out 27% SSA I don't think it caused a huge difference. Colon has a moderate population size which is not big enough to made Panama's total autosomal more negroid.Ancestral Gene Admixture and Population Structure
Ancestral estimates of genetic admixture are shown in Table
1. Modern Panamanians are a trihybrid group with
contributions from African (24%), European (25%), and
Ngöbe/Chibchan Amerindians (51%). Chibchan genes are
distributed throughout the country, showing relatively high
levels of contribution within all provinces but are mostly
concentrated in Coclé (70%), Chiriquí (64%), Veraguas
(50%), and Panama (50%), but in lesser amounts in Los
Santos (33%) and Colón (34%). Colon province showed the
highest proportion of African genes (47%), followed by
Panama province (27%) and Los Santos (25%). The lowest
amount of African genes was found in Coclé (10.2%) and
Chiriquí (14.8%). Significant proportion of European genes
were 42% in Los Santos, 40% Herrera and the lowest was in
Colon (18.6%). Overall, Panama as country showed high
genetic heterogeneity (86%). The most heterogeneous
provinces were Panama and Colón with 85% and Veraguas
with 82%. The least heterogeneous provinces were Coclé
(70%) and Chiriquí (72%)
There is another study that showed the admixture of Panama was 38% of African, 36% Amerindian and 25% European genes. But I'm not sure what method they used nor the amount of samples/regions sampled. When looking at genetic studies it is important to not focus in one. If you have more you can post them here.
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