Wahlund effect

https://doi.org/10.1351/goldbook.15127
Net deficit of heterozygotes when two populations, each in Hardy–Weinberg equilibrium but with different allele frequencies, are mixed and the genotype frequencies quantified in a combined population sample.
Source:
PAC, 2009, 81, 829. (Glossary of terms used in ecotoxicology (IUPAC Recommendations 2009)) on page 962 [Terms] [Paper]