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Frequency of chromosome polymorphism for pericentric inversions and B-chromosomes in Spanish populations of Rattus rattus frugivorus

✍ Scribed by R. G. Ladron de Guevara; R. Diaz Guardia

Book ID: 104634276
Publisher: Springer Netherlands
Year: 1981
Tongue: English
Weight: 542 KB
Volume: 57
Category: Article
ISSN: 0016-6707
DOI: 10.1007/bf00131234

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✦ Synopsis

Inversion frequencies in chromosomes 16 and 18 and B-chromosome frequency have been studied in three populations of Rattus rattus frugivorus.

In two of these, Cuenca and San Pedro del Pinatar, the frequencies of homozygous and heterozygous individuals do not differ significantly from the Hardy-Weinberg equilibrium for both chromosome pairs. By contrast, in the Vega de Granada population there are fewer heterozygous and more homozygous individuals than expected on the basis of the Hardy-Weinberg distribution, although the frequency distributions of karyotypes in these three populations are not significantly different.

In relation to the B chromosome, the Cuenca and San Pedro populations have frequencies of B-carrying animals of 0.25 and 0.22 respectively, the Vega de Granada population of 0.80.

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