Coalescence is the process by which two or more droplets (or bubbles) merge during contact to form a single daughter droplet (or bubble).
WordNet definition: the union of diverse things into one body or form or group; the growing together of parts. WordNet is a semantic lexicon for the English language. ...
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Coalescence describes the idea that any sample of genetic sequences from any number of living things (that is, bacteria, archaea and eukaryotes) can be traced back to a common ancestor in the past.
Coalescent theory describes the population genetics probabilistic theory that studies coalescence times for genes and alleles under genetic drift.
However, coalescence is impeded by balancing selection and is difficult to analyze for gene loci that are under selection.