Related Experiment Video
Updated: Sep 28, 2026

Assessing Differences in Sperm Competitive Ability in Drosophila
Published on: August 22, 2013
Racial differences in mole proneness
1Department of Dermatology, Sint Anna Hospital, Oss, The Netherlands.
Mole counts were studied in relation to skin complexion in various racial groups. White children had a median total number of naevocytic naevi of 17.0, versus 2.5 in non-white children (p less than 0.001). Young white adults showed a similar mole proneness to that of coloured subjects (61.0 versus 16.0; p less than 0.001). With regard to moles greater than 2 mm diameter in the young-adult group, white subjects again exhibited a higher median count than non-white subjects (5.5 versus 1.0; p less than 0.001). There was an inverse gradient of mole counts in young adults from subjects of white complexion through those of mixed ancestry, Oriental ancestry, to those of Negroid descent. This study indicates that there is a strong racial background predisposing to the development of naevocytic naevi.
Mole counts were studied in relation to skin complexion in various racial groups. White children had a median total number of naevocytic naevi of 17.0, versus 2.5 in non-white children (p less than 0.001). Young white adults showed a similar mole proneness to that of coloured subjects (61.0 versus 16.0; p less than 0.001). With regard to moles greater than 2 mm diameter in the young-adult group, white subjects again exhibited a higher median count than non-white subjects (5.5 versus 1.0; p less than 0.001). There was an inverse gradient of mole counts in young adults from subjects of white complexion through those of mixed ancestry, Oriental ancestry, to those of Negroid descent. This study indicates that there is a strong racial background predisposing to the development of naevocytic naevi.
More Related Videos
12:37Pharmacologic Induction of Epidermal Melanin and Protection Against Sunburn in a Humanized Mouse Model
Published on: September 7, 2013
11:54Microsatellite DNA Genotyping and Flow Cytometry Ploidy Analyses of Formalin-fixed Paraffin-embedded Hydatidiform Molar Tissues
Published on: October 20, 2019
Related Concept Videos
Mate Choice
X-linked Traits
Background and Environment Affect Phenotype
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
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...
X-linked Traits
Natural Selection and Mating Preferences
Females, due to their biological roles in conception, pregnancy, and nursing, inherently...