Chromosomal fusion and meiotic behaviour in Delena cancerides (Araneae: Sparassidae). II. Chiasma position and its implications for speciation

Autor: D. M. Rowell
Rok vydání: 1991
Předmět:
Zdroj: Genome. 34:567-573
ISSN: 1480-3321
0831-2796
DOI: 10.1139/g91-087
Popis: Chiasma position is compared among huntsman spider populations possessing telocentric chromosomes and Robertsonian metacentrics in the homozygous and heterozygous condition. The results indicate that heterozygosity for fusions results in a significant difference in chiasma position from both the telocentric forms and fusion homozygotes. Differences between fusion homozygotes and ancestral telocentric forms are small or absent, and there is no evidence of chiasma interference across the centromere. It is argued that the observed association between Robertsonian rearrangements and speciation may be as much a result of chiasma redistribution as of segregational factors.Key words: spiders, chiasma position, recombination, speciation.
Databáze: OpenAIRE