Fingerprints and variation by sex

Egyptian Journal of Forensic Sciences. December , Cite as. The present work investigates the ridge characteristics and ridge density of fingerprints to determine gender differences among population of Punjab. The main characteristics studied were general pattern type, ridge density and minutiae or ridge characteristics with respect to general pattern type. Further, instead of using conventional method of ridge counting, Adobe Photoshop cs5 is used to conclude ridge density and minutiae characteristics.
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Human variability

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Ancestral background can be determined by fingerprints -- ScienceDaily

When fingermarks are not suited for automated fingerprint identification, caused by for instance, poor development or when no match can be found in the fingerprint database, the chemical composition can be used to extract additional information about the donor of the fingermark. DNA potentially allows identification, however, the recoverable amount of DNA present in fingermarks is often too low to allow successful DNA-profiling. Therefore, in this research we focus on a method of in situ analysis of the available nucleated cells in fingermarks without prior DNA sampling and extraction and target specific DNA sequences in these cells to reveal potential additional donor profile information. To prove the principle, we determine the sex of the fingermark donor by targeting specific sequences on the X and Y chromosome using fluorescent in situ hybridization. Successful determination of the donor's sex based on the presence of male or female cells in the fingermark depositions is demonstrated. Powder dusting and lifting the fingermarks with gelatine lifters does not influence fluorescent in situ hybridization as male and female nucleated cells can be established reliably in fingermark residues.

Fingerprints Yield Sex Info

The results were published last month October 13 in Analytical Chemistry. Males and females leave different levels and compositions of amino acids in their fingerprints. Previous studies had used the amino acid composition in fingerprints to differentiate between the two, but relied on instruments such as mass spectrometers. The team had volunteers—three males and three females—press their fingertips against a polyethylene surface.
A proof-of-concept study finds that it is possible to identify an individual's ancestral background based on his or her fingerprint characteristics -- a discovery with significant applications for law enforcement and anthropological research. We need to look at a much larger sample size and evaluate individuals from more diverse ancestral backgrounds. Anthropologists have looked at fingerprints for years, because they are interested in human variation. But this research has looked at Level 1 details, such as pattern types and ridge counts. Forensic fingerprint analysis, which is used in criminal justice contexts, looks at Level 2 details -- the more specific variations, such as bifurcations, where a fingerprint ridge splits.
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