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Sexual selection theory by its nature focuses on the differences between males and females; therefore empirical work tends to expect and consequently find and report many such differences. In temperature-dependent sex determination, temperature at a special developmental period induces the expression of certain genes which in turn produce an inner environment that trigger sex differentiation Valenzuela et al. Genetic correlations between the sexes in the evolution of sexual dimorphism and mating preferences. Please review our privacy policy. Performers Kaya LinViktor Belmont. World History. It is a paradox that all biologists are aware of variation in sex determination, sex change and alternative reproductive strategies, and still we continue to present this variation in terms of a two-sex norm and the deviations from this norm as alternatives and sex role- reversals.

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For example, in a species with chromosomal sex determination, the reaction norm of sex determination may be non-plastic low responsiveness to environmental influences and irreversible, or plastic as in species with a sex determination system combining both chromosomal and environmental factors.

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Drury, K. I have access to this world of perfection, grace and discipline like nobody else does. Sex is a particularly illustrative example of how the ubiquitous developmental plasticity of living systems means that biological determinism does not typically follow from biological theory.

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