Biochemical heterozygosity and morphological variability: interpopulational versus intrapopulational analyses.

Area of Science:

• Human genetics
• Anthropometry
• Population genetics

Background:

• Previous studies suggest a link between biochemical variability and morphological variation in populations.
• Interpopulational studies often examine heterozygosity between phenotypes using analysis of variance.

Purpose of the Study:

• To investigate the relationship between individual biochemical heterozygosity and anthropometric trait variation.
• To assess purported links within a midwestern Mennonite population using an intrapopulational approach.

Main Methods:

• Correlated individual biochemical heterozygosity with deviation from the mean for anthropometric traits.
• Analyzed data from 890 individuals, accounting for multiple testing.
• Examined sex-specific patterns of correlation.

Main Results:

• Few significant correlations were found when controlling for multiple tests, with low R-squared values.
• Distinct correlation patterns emerged between males (negative) and females (positive).
• Biochemical heterozygosity was calculated using a limited number of blood group systems.

Conclusions:

• Findings question previous studies due to methodological concerns (e.g., unprotected alpha values, limited heterozygosity measures).
• No direct evidence supports a relationship between biochemical heterozygosity and morphological variability in this population.
• Sex differences in correlation patterns warrant further investigation.