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Quantitative Analysis of C-bands in Chromosomes 1, 9, 16, and Y of Twins

Published online by Cambridge University Press:  01 August 2014

Marise P. Pedrosa ,
F.M. Salzano ,
Margarete S. Mattevi  and
Judith Viégas
Marise P. Pedrosa
Affiliation:
Centro de Ciências Biológicas Universidade Federal de Alagoas, Praça Afrânio Jorge, 57000 Maceió, Brazil
F.M. Salzano*
Affiliation:
Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, 90000 Porto Alegre, Brazil
Margarete S. Mattevi
Affiliation:
Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, 90000 Porto Alegre, Brazil
Judith Viégas
Affiliation:
Departmento de Zoologie e Genética, Instituto de Biologie, Universidade Federal do Pelotas, 96100 Pelotas, RS, Brazil
*
Departmento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Caixa Postal 19953, 90000 Porto Alegre, RS, Brazil

Abstract

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Thirty-two pairs of Caucasoid twins, 16 monozygotic (MZ) and 16 dizygotic (DZ) of the same sex, were studied by densitometry in relation to the C-bands of chromosomes 1, 9, 16, and Y. Confirming earlier results, concordance was not absolute among MZ. Estimates of the degree of genetic determination for these traits varied from 0.73 to 0.89 for the autosomes and from 0.86 to 0.95 for the Y. There are now stronger indications that a fraction of the intergeneration variability found in these structures may be real, probably due to mitotic and/or meiotic unequal crossing-over.

Keywords

C-bandsHeterochromatinChromosome variabilityDensitometrie analysis of chromosomes
Type
Research Article
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 32 , Issue 3-4 , July 1983 , pp. 257 - 260
Copyright
Copyright © The International Society for Twin Studies 1983

References

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