Sex Determination: Genetic Models for Oysters
In oysters, sex is determined partly by environment, but previous studies employing controlled crosses suggest that genetic factors are also important. Sex ratios in both full- and half-sib families of the Pacific oyster show paternal control of sex ratio and suggest that a single major gene with 2...
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fthighwire:oai:open-archive.highwire.org:jhered:101/5/602 2023-05-15T17:54:17+02:00 Sex Determination: Genetic Models for Oysters Hedrick, Philip W. Hedgecock, Dennis 2010-09-01 00:00:00.0 text/html http://jhered.oxfordjournals.org/cgi/content/short/101/5/602 https://doi.org/10.1093/jhered/esq065 en eng Oxford University Press http://jhered.oxfordjournals.org/cgi/content/short/101/5/602 http://dx.doi.org/10.1093/jhered/esq065 Copyright (C) 2010, American Genetic Association Original Articles TEXT 2010 fthighwire https://doi.org/10.1093/jhered/esq065 2010-08-22T20:05:02Z In oysters, sex is determined partly by environment, but previous studies employing controlled crosses suggest that genetic factors are also important. Sex ratios in both full- and half-sib families of the Pacific oyster show paternal control of sex ratio and suggest that a single major gene with 2 genotypes controls sex in the Pacific oyster, with FM oysters being male and FF oysters maturing as male or female. Here, we show that such a model does indeed produce a stable polymorphism for either single or multiple age-class populations, though under limited ranges of f , the probability that an FF individual matures as a female. However, this 2-genotype model cannot explain observed heterogeneity of sex ratios among progeny from different dams within half-sib families. We propose an alternative 3-genotype model that also produces a stable polymorphism, for either single or multiple age-class populations, but over all values of f between zero and one. This model accounts for sex ratio heterogeneity among male half-sib families because it features 2 types of females, a protandric FM and a fixed female FF . Furthermore, the 3-genotype model, accounts for the frequencies of mating types inferred from the observed sex ratios of families more closely than the 2-genotype model. Although the mechanism of sex determination may ultimately prove more complex, simple genetic mechanisms can account for the broad features of sexual maturation in oyster families and the stability of sex ratios in populations. Text Pacific oyster HighWire Press (Stanford University) Pacific Journal of Heredity 101 5 602 611 |
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Original Articles Hedrick, Philip W. Hedgecock, Dennis Sex Determination: Genetic Models for Oysters |
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Original Articles |
description |
In oysters, sex is determined partly by environment, but previous studies employing controlled crosses suggest that genetic factors are also important. Sex ratios in both full- and half-sib families of the Pacific oyster show paternal control of sex ratio and suggest that a single major gene with 2 genotypes controls sex in the Pacific oyster, with FM oysters being male and FF oysters maturing as male or female. Here, we show that such a model does indeed produce a stable polymorphism for either single or multiple age-class populations, though under limited ranges of f , the probability that an FF individual matures as a female. However, this 2-genotype model cannot explain observed heterogeneity of sex ratios among progeny from different dams within half-sib families. We propose an alternative 3-genotype model that also produces a stable polymorphism, for either single or multiple age-class populations, but over all values of f between zero and one. This model accounts for sex ratio heterogeneity among male half-sib families because it features 2 types of females, a protandric FM and a fixed female FF . Furthermore, the 3-genotype model, accounts for the frequencies of mating types inferred from the observed sex ratios of families more closely than the 2-genotype model. Although the mechanism of sex determination may ultimately prove more complex, simple genetic mechanisms can account for the broad features of sexual maturation in oyster families and the stability of sex ratios in populations. |
format |
Text |
author |
Hedrick, Philip W. Hedgecock, Dennis |
author_facet |
Hedrick, Philip W. Hedgecock, Dennis |
author_sort |
Hedrick, Philip W. |
title |
Sex Determination: Genetic Models for Oysters |
title_short |
Sex Determination: Genetic Models for Oysters |
title_full |
Sex Determination: Genetic Models for Oysters |
title_fullStr |
Sex Determination: Genetic Models for Oysters |
title_full_unstemmed |
Sex Determination: Genetic Models for Oysters |
title_sort |
sex determination: genetic models for oysters |
publisher |
Oxford University Press |
publishDate |
2010 |
url |
http://jhered.oxfordjournals.org/cgi/content/short/101/5/602 https://doi.org/10.1093/jhered/esq065 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Pacific oyster |
genre_facet |
Pacific oyster |
op_relation |
http://jhered.oxfordjournals.org/cgi/content/short/101/5/602 http://dx.doi.org/10.1093/jhered/esq065 |
op_rights |
Copyright (C) 2010, American Genetic Association |
op_doi |
https://doi.org/10.1093/jhered/esq065 |
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Journal of Heredity |
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101 |
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5 |
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602 |
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611 |
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1766162033138466816 |