Quantitative analysis of C bands in chromosomes 1, 9, and 16 of Brazilian Indians and Caucasoids.

Abstract:

:Densitometric C-band measurements in chromosomes 1, 9, and 16 of 394 Indians and 40 Caucasoids living in Brazil are reported. No significant intratribal variability in the average length of these regions was observed, and the intertribal variation showed no consistent patterns. But the Caucasoids always presented lower means. The relative C-band sizes of these three chromosomes, however, were very similar in Indians and Caucasoids. The indices of heteromorphism displayed analogous results; only in chromosome 16 are they dissimilar in these two ethnic groups. An unexpected sex difference was observed in the C-band sizes of this chromosome, females uniformly presenting higher averages than males. Centromeric heterochromatin appeared in 6% and 9% respectively of the short arms of chromosomes 1 and 9 among the Caucasoids, while among the Indians its prevalence was 2% in both chromosomes.

journal_name

Hum Genet

journal_title

Human genetics

authors

Erdtmann B,Salzano FM,Mattevi MS,Flores RZ

doi

10.1007/BF00271168

subject

Has Abstract

pub_date

1981-01-01 00:00:00

pages

58-63

issue

1

eissn

0340-6717

issn

1432-1203

journal_volume

57

pub_type

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