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Tests for Partial Sex-linkage in Total Color-blindness1

Published online by Cambridge University Press:  01 August 2014

Katumi Tanaka*
Affiliation:
National Institute of Genetics, Misima, Japan

Summary

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Data on congenital total color-blindness were collected from the Japanese literature and through private communication, and tested for partial sex-linkage. Twenty sibships derived from consanguineous marriages, in which mode of relationship of the parents was fully known, were analyzed by using the direct method, and the crossover values 37.9-39.0% were found. Remaining 26 complete sibships were analyzed by using the indirect method, and a crossover value of 23.7% was obtained.

The higher recombination value derived from the direct method may possibly due to inaccurate information about paternal genotypes.

Sommario

SOMMARIO

Dalla bibliografia giapponese e direttamente si sono raccolti dati sulla acromatopsia totale, dati che sono stati controllati per un parziale sex-linkage.

Venti fratrie derivate da matrimoni fra consanguinei, in cui il modo di parentela dei genitori era esattamente noto, sono state analizzate usando il metodo diretto, e si sono trovati dei valori di crossover del 37,9-39,0%. Le rimanenti 26 fratrie complete sono state analizzate usando il metodo indiretto, e si è ottenuto un valore di crossover del 23,7%.

Il più alto valore di ricombinazione derivato dal metodo diretto può forse essere dovuto ad informazioni non accurate sui genotipi paterni.

Zusammenfassung

ZUSAMMENFASSUNG

In der japanischen Literatur gefundene Angaben über angeborene totale Farbenblindheit sind auf partielle geschlechts-gekoppelte Vererbung geprüft worden. 20 Sippenschaften aus blutsverwandten Ehen stammend, in denen die Verwandtschafts-beziehungen klargestellt waren, sind mit Hilfe der direkten Methode analysiert worden, wobei die Austauschwerte 37.9-39% gefunden wurden.

Andere 26 vollständige Sippenschaften sind mit der indirekten Methode geprüft worden, wobei der Austauschwert 23.7% gefunden wurde. Die höheren Austauschwerte im ersteren Fall sind vielleicht auf ungenaue Angaben über die elterlichen Genotypen zurückzuführen.

Type
Research Article
Copyright
Copyright © The International Society for Twin Studies 1957

Footnotes

1

Contribution No 133 from the National Institute of Genetics, Japan.

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