scholarly journals A Novel Candidate Gene for Temperature-Dependent Sex Determination in the Common Snapping Turtle

Genetics ◽  
2016 ◽  
Vol 203 (1) ◽  
pp. 557-571 ◽  
Author(s):  
Anthony L. Schroeder ◽  
Kelsey J. Metzger ◽  
Alexandra Miller ◽  
Turk Rhen
Keyword(s):  
Sex Determination ◽  
Candidate Gene ◽  
Temperature Dependent ◽  
Snapping Turtle ◽  
The Common

Effect of Dichlorodiphenyltrichloroethane on Sex Determination of the Common Snapping Turtle (Chelydra serpentina serpentina)

1999 ◽  
Vol 43 (3) ◽  
pp. 284-291 ◽  
Author(s):  
Melinda J. Portelli ◽  
Shane R. de Solla ◽  
Ronald J. Brooks ◽  
Christine A. Bishop
Keyword(s):  
Sex Determination ◽  
Chelydra Serpentina ◽  
Snapping Turtle ◽  
The Common

scholarly journals Heritable variation for sex ratio under environmental sex determination in the common snapping turtle (Chelydra serpentina).

Genetics ◽  
1992 ◽  
Vol 131 (1) ◽  
pp. 155-161 ◽  
Author(s):  
F J Janzen
Keyword(s):  
Genetic Variation ◽  
Sex Ratio ◽  
Sex Determination ◽  
Sex Ratios ◽  
Chelydra Serpentina ◽  
Heritable Variation ◽  
Snapping Turtle ◽  
Primary Sex Ratio ◽  
Quantitative Genetic ◽  
The Common

Abstract The magnitude of quantitative genetic variation for primary sex ratio was measured in families extracted from a natural population of the common snapping turtle (Chelydra serpentina), which possesses temperature-dependent sex determination (TSD). Eggs were incubated at three temperatures that produced mixed sex ratios. This experimental design provided estimates of the heritability of sex ratio in multiple environments and a test of the hypothesis that genotype x environment (G x E) interactions may be maintaining genetic variation for sex ratio in this population of C. serpentina. Substantial quantitative genetic variation for primary sex ratio was detected in all experimental treatments. These results in conjunction with the occurrence of TSD in this species provide support for three critical assumptions of Fisher's theory for the microevolution of sex ratio. There were statistically significant effects of family and incubation temperature on sex ratio, but no significant interaction was observed. Estimates of the genetic correlations of sex ratio across environments were highly positive and essentially indistinguishable from + 1. These latter two findings suggest that G x E interaction is not the mechanism maintaining genetic variation for sex ratio in this system. Finally, although substantial heritable variation exists for primary sex ratio of C. serpentina under constant temperatures, estimates of the effective heritability of primary sex ratio in nature are approximately an order of magnitude smaller. Small effective heritability and a long generation time in C. serpentina imply that evolution of sex ratios would be slow even in response to strong selection by, among other potential agents, any rapid and/or substantial shifts in local temperatures, including those produced by changes in the global climate.

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