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Simple Segregations in Two Families of Mixed Origin

Published online by Cambridge University Press:  01 August 2014

David C. Rife
David C. Rife*
Affiliation:
Division of Biological Sciences, University of Florida, Gainesville
*
Division of Biological Sciences, University of Florida, 220 William Bartram Hall, Gainesville, Florida 32601, USA

Summary

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Variations in skin color and palm patterns were investigated in two families in which the fathers are of mixed Negro-White origin and the mothers are Dutch. Segregation among the children indicates that two genes with cumulative effects are responsible for dark shades of skin in family A, whereas only one gene is responsible for dark skin in family B.

In family A the mother is heterozygous for accessory triradii and vestigial patterns in distal palmar areas, whereas in family B the father is heterozygous. Skin color and patterns in distal palmar areas do not occur independently among the children in family B, suggesting the possibility of linkage.

Type
Research Article
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 20 , Issue 3 , July 1971 , pp. 284 - 288
Copyright
Copyright © The International Society for Twin Studies 1971

References

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