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Genetic basis of hair medulla by twin study

✍ Scribed by A. B. Das-Chaudhuri

Publisher
John Wiley and Sons
Year
1976
Tongue
English
Weight
195 KB
Volume
44
Category
Article
ISSN
0002-9483

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✦ Synopsis

Abstract

Data on the incidence of medulla of human head hair based on 9,600 strands examined from 48 pairs of zygosity β€” determined German twins were quantified as medullary ratio and subjected to variance analysis to give information about genetic significance of the character concerned. The results of F test and heritability estimate yielded significant values indicating the presence of a strong genetic component of variability in the incidence of medulla of human head hair. Sex influence upon the character is found to be absent.

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The purpose of this study was to examine the roles of genetic and environmental factors in the etiology of epilepsy and seizures in twins ascertained from the Virginia Twin Registry. Health history information on twins was collected by questionnaire. Concordance rates were calculated and used to est