| Registro completo |
| Provedor de dados: |
Genet. Mol. Biol.
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| País: |
Brazil
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| Título: |
Temperature and the progeny sex-ratio in Sciara ocellaris (Diptera, Sciaridae)
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| Autores: |
Nigro,Rogério G.
Campos,Maria Cristina C.
Perondini,André Luiz P.
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| Data: |
2007-01-01
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| Ano: |
2007
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| Palavras-chave: |
Sex determination
Chromosome elimination
Embryo
Insect
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| Resumo: |
We found that the sex-ratio of an amphigenic strain of Sciara ocellaris varied widely from progenies with few males to progenies containing a larger proportion of males, with single-sex progenies being rare. The sex-ratio distributions were dependent on the temperature at which the stocks of flies were raised, with the sex-ratio distributions being symmetrical (i.e. about 50% males) at 18 °C and 20 °C while at the higher temperatures of 24 °C and 28 °C the distributions were skewed toward a high proportion of females with the mean proportion of males decreasing to about 30-37% per progeny. Temperature-shift experiments showed that high temperatures were effective only during the last stages of female pupal development plus a period after adult emergence, stages corresponding to oocyte maturation. When imagine females were exposed to temperatures as low as 12 °C the sex-ratio distributions of their progeny were skewed toward a high proportion of males per progeny. No differential fecundity was involved in these progeny sex-ratio modifications. Egg-to-adult survival was lower at 18 °C and 28 °C but no correlations with skewing in the sex ratio distributions were observed, indicating that modifications in progeny sex-ratio did not involve the differential survival of a particular sex.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000100026
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| Editor: |
Sociedade Brasileira de Genética
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| Relação: |
10.1590/S1415-47572007000100026
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| Formato: |
text/html
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| Fonte: |
Genetics and Molecular Biology v.30 n.1 2007
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| Direitos: |
info:eu-repo/semantics/openAccess
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