Sexual dimorphism in digit‐length ratios of laboratory mice

@article{Brown2002SexualDI,
  title={Sexual dimorphism in digit‐length ratios of laboratory mice},
  author={Windy M. Brown and Christopher J Finn and S. Marc Breedlove},
  journal={The Anatomical Record},
  year={2002},
  volume={267}
}
The lengths of the index finger (2D) and ring finger (4D) are sexually dimorphic in humans, and men have a smaller 2D:4D ratio compared to women. Prenatal androgens appear to be important in the development of the 2D:4D sex difference, since it has been reported in children as young as 2 years old, and since humans exposed to supernormal prenatal androgen levels display a smaller 2D:4D ratio. We tested whether another mammalian species in which the process of peripheral sexual differentiation… 

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Digit ratio (2D:4D) and behavioral differences between inbred mouse strains

Large differences in digit ratio between the strains are found and it is suggested that inbred mice are a promising system for investigating the correlation between digit ratio and behavioral traits.

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These findings provide the first evidence that digit ratios are sexually dimorphic in any reptile species and are consistent with the idea that the genetic link between limb development and the urogenital system had been established with the evolution of the earliest terrestrial tetrapods.

Intrauterine Position Effects on Anogenital Distance and Digit Ratio in Male and Female Mice

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Avian hind‐limb digit length ratios measured from radiographs are sexually dimorphic

These findings show for the first time in avian species that sex differences in digit ratios have an osteometric basis, a fundamental prerequisite for a role of Hox genes in originating such dimorphism.

Digit Ratio (2D∶4D) Differences between 20 Strains of Inbred Mice

The inbred mice model presents an opportunity for researchers to investigate the genetic, and gene-environmental influence on the development of digit ratios, and calls into question the use of this trait as a broadly applicable indicator for prenatal androgen exposure.

Sexual dimorphism in digit length ratios of the second to fourth digits (2D:4D) in Blanford's fringe-toed lizard Acanthodactylus blanfordi Boulenger, 1918 (Sauria: Lacertidae) in the south of Iran

Sexual dimorphism in the length of the fingers was observed only in 2D: 4D on the right side of the body in forelimbs and hindlimbs, and the value of this trait was higher in males than females and this difference was statistically significant P ≤0.05.

Digit ratios in two lacertid lizards: sexual dimorphism and morphological and physiological correlates

Comparing digit ratios of two Podarcis lizards among sexes, colour morphs and species concludes that digit ratios in lizards deserve attention, because they exhibit sexual dimorphism and correlate with ecologically relevant morphological and performance variables.

Study of Sexual Dimorphism in Second-to-fourth Digit Length Ratio (2D: 4D) in the Green-Bellied Lizard (Darevskia cholorogaster) from Iran

The digits ratios observed in D. cholorogaster could be referred to microhabitat use by this species on different surfaces, besides basic genetic pattern and other ecological effects as foraging and mating, and supported a genetic pattern seen in humans and most mammals, inconsistent withbasic genetic pattern in reptiles.
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