Autosomal Polymorphism via a Translocation in the Guinea Pig, <i>Cavia porcellus</i> L.

Abstract

The karyotype of the guinea pig, C. porcellus L. was investigated using chromosomal preparations from various tissues of 15 animals (nine females and six males). The diploid number is 2N = 64. Only four large autosomal pairs and the X chromosome are individually identifiable. One entire X chromosome and possibly the short arms of the second X in females show late DNA replication. A polymorphism involving the short arms of the longest pair of autosomes is present in this population and this polymorphism is shown to segregate in families.

The chromosomes of the hystricomorphous family Ctenodactylidae (Rodentia: ?Sciuromorpha) and their bearing on the relationships of the four living genera

“…In spite of the problems in gametogenesis that may follow this type of translocation, it seems to have been a common type of change in the ctenodactylids. Polymorphic pairs of chromosomes resulting from similar translocations are known in the Caviidae (Cohen & Pinsky, 1966;George et al, 1972). ----_ --7/8th 5.3%m…”

Molecular systematics, taxonomy and biogeography of the genus Cavia (Rodentia: Caviidae)

“…Work on the genus since the 1960s has been limited to regional systematic and distributional studies in Argentina, Uruguay, and southern Brazil (Massoia 1973; Ximenez 1980); karyological descriptions (Cohen and Pinsky 1966; George et al 1972; Pantaleão 1978; Maia 1984; Gava et al 1998; Dunnum and Salazar‐Bravo 2006); accounts in regional or country compilation works (Massoia and Fornes 1967; Husson 1978; Pine et al 1979; Eisenberg 1989; Eisenberg and Redford 1992; Anderson 1997; Linares 1998; Redford and Eisenberg 1999; Gonzales 2001); records of occurrence (Contreras 1972, 1980; Williams et al 1983); or reproductive and behavioral studies (Rood 1972; Sachser 1998; Sachser et al 1999; Kraus et al 2003; Asher et al 2004).…”

Added Heterochromatin Segments in Chromosomes of Squirrel Monkeys (<i>Saimiri sciuveu</i><i>s</i>)

“…Structural heterozygosity, resulting from an addition of such so-called 'supernumerary' segments to existing members of the karyotype, has been observed in the second largest autosomes of Rattus norvegicus [Ohno and Kinosita, 1955], the X chromosome pair of Cricetus griseus [Yerganian et al, 1960], the short arms ofNo. 1 chromosome of the guinea pig, Cavia cobaya [Ohno et al, 1961;Cohen and Pinskey, 1966], a subtelocentric pair of Cavia procellus [Manna and T alukdar, 1964], one of a chromosome pair of a female Cercocebus torquatus [De Boer, 1971], the satellite or the short arm of acrocentrics and in the Y chromosomes of man [Tjio et al, 1960;Moorhead et al, 1961;Ellis and Penrose, 1961;Cooper and H irschhorn, 1962;G ray et al, 1962;Schmid, 1962;Chapelle et al, 1963;Court Brown et a l, 1966].…”