Genetic Epidemiology, Translational Neurogenomics, Psychiatric Genetics and Statistical Genetics Laboratories investigate the pattern of disease in families, particularly identical and non-identical twins, to assess the relative importance of genes and environment in a variety of important health problems.
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28568756
TITLE
EVOLUTION OF PHENOTYPIC VARIANCE.
ABSTRACT
A cornerstone of evolutionary theory is that the phenotypic variance of a population may be partitioned into genetic and environmental (nonheritable) components. The traditional motivation for this distinction is that the rate of evolution under natural selection depends on the (relative) magnitudes of certain genetic components of variance. The components of variation are also interesting from another perspective, as illustrated here. Phenotypic variation may be selectively maintained in a population according to its components: selection may favor the maintenance of only the environmental components, only the genetic components, or be indifferent to the composition of the variance. Even when selection is shown to favor phenotypic variation regardless of its components, the possibility exists that environmental variance will evolve to displace the genetic components or vice versa. Environmental and genetic factors may thus compete to produce a given selected level of phenotypic variance. A test of some of these models is provided from the example of seed dormancy: the prediction that variation in seed germination time should be purely environmental is supported by the demonstration of low heritability of germination time in the two available studies.
1987 The Society for the Study of Evolution.
DATE PUBLISHED
1987 Mar
HISTORY
PUBSTATUS PUBSTATUSDATE
received 1985/08/30
accepted 1986/10/23
entrez 2017/06/02 06:00
pubmed 1987/03/01 00:00
medline 1987/03/01 00:01
AUTHORS
NAME COLLECTIVENAME LASTNAME FORENAME INITIALS AFFILIATION AFFILIATIONINFO
Bull JJ Bull J J JJ Department of Zoology, University of Texas, Austin, TX, 78712.
INVESTIGATORS
JOURNAL
VOLUME: 41
ISSUE: 2
TITLE: Evolution; international journal of organic evolution
ISOABBREVIATION: Evolution
YEAR: 1987
MONTH: Mar
DAY:
MEDLINEDATE:
SEASON:
CITEDMEDIUM: Internet
ISSN: 1558-5646
ISSNTYPE: Electronic
MEDLINE JOURNAL
MEDLINETA: Evolution
COUNTRY: United States
ISSNLINKING: 0014-3820
NLMUNIQUEID: 0373224
PUBLICATION TYPE
PUBLICATIONTYPE TEXT
Journal Article
COMMENTS AND CORRECTIONS
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GENERAL NOTE
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