Related Experiment Video
Updated: May 22, 2026

Assessing Differences in Sperm Competitive Ability in Drosophila
Published on: August 22, 2013
Sex determination from the second cervical vertebra: a test of Wescott's method on a modern American sample
Jonathan D Bethard1, Billie L Seet
1Department of Anatomy and Neurobiology, Boston University School of Medicine, 72 East Concord St (L 1004) Boston, MA 02118, USA. jbethard@bu.edu
Abstract:
Numerous methods for establishing a biological profile exist; however, many of these methods rely on the recovery of several specific bones or on fragile skeletal elements that are sometimes irrecoverable. It is for this reason new methods utilizing other previously under-documented bones should be established and tested by the forensic anthropological community. This study tests the accuracy of Wescott's (J Forensic Sci 2000;45(2)) method for determining sex from the second cervical vertebra. Specimens were drawn from the donated skeletal collection curated at the Hamilton County Forensic Center (n = 57) and the William M. Bass Donated Skeletal Collection (n = 243). Both intra- and inter-observer error rates were low and accurate classifications ranged from 78% (females-Function 1) to 90.6% (males-Function 5). Of the five functions, Function 4 achieved the highest overall accuracy, with 260 individuals (86.7%) falling into the correct category. Overall, this method is an effective classificatory tool for sex estimation.
Related Concept Videos
The Ratio of X Chromosome to Autosomes
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female Drosophila...
The Y Chromosome Determines Maleness
Evolution
Around 300 million years ago, the two sex chromosomes diverged from two identical autosomal chromosomes. Over time, the Y chromosome has lost most of its genes, shrinking in size. Today,...
X and Y Chromosomes
The germline cells such as egg and sperm cells carry only half the number of chromosomes, i.e., 22 autosomes and one sex chromosome. All eggs have an X chromosome, while sperm cells can carry an X or...
Dosage Compensation
In addition to sexual development, the X chromosome has genes involved in autosomal functions such as brain development and the immune system. Therefore, males and females with distinct numbers of X chromosomes will have...
Wald-Wolfowitz Runs Test II
For binary data, runs are identified using symbols such as + and −, or equivalently, 1s and 0s. In...
Wilcoxon Signed-Ranks Test for Median of Single Population

