Sten Gösta William Wahlund (1901 — 1976) was a Swedish

Sweden

Sweden , officially the Kingdom of Sweden , is a Nordic country on the Scandinavian Peninsula in Northern Europe. Sweden borders with Norway and Finland and is connected to Denmark by a bridge-tunnel across the Öresund....

 human geneticist

Human genetics

Human genetics describes the study of inheritance as it occurs in human beings. Human genetics encompasses a variety of overlapping fields including: classical genetics, cytogenetics, molecular genetics, biochemical genetics, genomics, population genetics, developmental genetics, clinical genetics,...

 and politician. He is best known for first identifying the Wahlund effect

Wahlund effect

In population genetics, the Wahlund effect refers to reduction of heterozygosity in a population caused by subpopulation structure. Namely, if two or more subpopulations have different allele frequencies then the overall heterozygosity is reduced, even if the subpopulations themselves are in a...

, that subpopulations with different allele frequencies cause reduced heterozygosity that than is expected

Expected value

In probability theory, the expected value of a random variable is the weighted average of all possible values that this random variable can take on...

 from Hardy-Weinberg equilibrium.

He graduated from Uppsala University

Uppsala University

Uppsala University is a research university in Uppsala, Sweden, and is the oldest university in Scandinavia, founded in 1477. It consistently ranks among the best universities in Northern Europe in international rankings and is generally considered one of the most prestigious institutions of...

 in 1924 and received a PhD in 1933. He later became important in the Bondeförbundet and was a member of the Swedish parliament

Parliament of Sweden

The Riksdag is the national legislative assembly of Sweden. The riksdag is a unicameral assembly with 349 members , who are elected on a proportional basis to serve fixed terms of four years...

.