Studies of the squirrel monkey, <i>Saimiri sciureus, </i>genome

Abstract

Cytological analysis of a squirrel monkey indicates a considerable degree of chromosomal polymorphism. DNA synthetic patterns reveal late synthesis in chromosomal segments that are C-band negative and asynchrony in DNA replication between homologs. Location of a satellite DNA with a CsCl neutral buoyant density of 1.691 g/ml was mainly in the noncentromeric constitutive heterochromatin.

Chromosome banding patterns of Saimiri Vanzolinii Ayres, 1985 (Primates, Cebidae)

“…However, a number of morphological variations in karyotypes were described, among them the occurrence of pericentric inversions, correlated by Hershkovifz (1984) with the geographical distributions. Another source of variation was the occurrence of differences in the amount of heterochromatin (Jones and Ma, 1975;Ma and Jones, 1975;Lau et al, 1977).Here we describe the karyotype of S, vanzolinii, described as a new species in the preceding paper, from the general área of the mouth of the Rio Japurá, on the Amazon. Chromosome investigations were performed on skin-derived fibroblasts from one male and one female from the type locality, Lake Mamírauá.G-and C-banding patterns and the distribution of the nucleolar organizer regions were studied (Figs.…”

“…However, a number of morphological variations in karyotypes were described, among them the occurrence of pericentric inversions, correlated by Hershkovifz (1984) with the geographical distributions. Another source of variation was the occurrence of differences in the amount of heterochromatin (Jones and Ma, 1975;Ma and Jones, 1975;Lau et al, 1977).…”

Unusual distribution of constitutive heterochromatin (C-bands) in the somatic chromosomes of a passerine birdErithacus svecicus

“…Lau et al22 have proposed that such heterozygosity may be due to inter-subspecific hybridization between individuals of different geographical races. Only 3-4 pairs of microchromosomes are entirely heterochromatic.…”