Editing Multimodal distribution (section)

===Biology===

In biology, several factors are known to contribute to bimodal distributions of population sizes{{citation needed|date=March 2019}}:

*the initial distribution of individual sizes
*the distribution of growth rates among the individuals
*the size and time dependence of the growth rate of each individual
* mortality rates that may affect each size class differently
* the DNA methylation in human and mouse genome.
* the dynamics of transcription at the promoter region.

The bimodal distribution of sizes of [[weaver ant]] workers arises due to existence of two distinct classes of workers, namely major workers and minor workers.<ref name="Weber1946">{{cite journal|author=Weber, NA|year=1946| title=Dimorphism in the African ''Oecophylla'' worker and an anomaly (Hym.: Formicidae)| journal=Annals of the Entomological Society of America| volume=39| pages=7–10| url=http://antbase.org/ants/publications/10434/10434.pdf| doi=10.1093/aesa/39.1.7}}</ref>

The [[distribution of fitness effects]] of mutations for both whole [[genome]]s<ref>{{cite journal|last=Sanjuán|first=R|title=Mutational fitness effects in RNA and single-stranded DNA viruses: common patterns revealed by site-directed mutagenesis studies.|journal=Philosophical Transactions of the Royal Society of London B: Biological Sciences|date=Jun 27, 2010|volume=365|issue=1548|pages=1975–82|pmid=20478892|doi=10.1098/rstb.2010.0063|pmc=2880115}}</ref><ref>{{cite journal|last=Eyre-Walker|first=A|author2=Keightley, PD|title=The distribution of fitness effects of new mutations.|journal=Nature Reviews Genetics|date=Aug 2007|volume=8|issue=8|pages=610–8|pmid=17637733|doi=10.1038/nrg2146|s2cid=10868777}}</ref> and individual [[gene]]s<ref>{{cite journal|last=Hietpas|first=RT|author2=Jensen, JD |author3=Bolon, DN |title=Experimental illumination of a fitness landscape.|journal=Proceedings of the National Academy of Sciences of the United States of America|date=May 10, 2011|volume=108|issue=19|pages=7896–901|pmid=21464309|doi=10.1073/pnas.1016024108|pmc=3093508|bibcode = 2011PNAS..108.7896H |doi-access=free}}</ref> is also frequently found to be bimodal with most [[mutations]] being either neutral or lethal with relatively few having intermediate effect.