The B-chromosomes ofLocusta migratoriaI. Detection of negative correlation between mean chiasma frequency and the rate of accumulation of the B's; a reanalysis of the available data about the transmission of these B-chromosomes

✍ Scribed by J. Cabrero; E. Viseras; J. P. M. Camacho

• Publisher: Springer Netherlands
• Year: 1984
• Tongue: English
• Weight: 917 KB
• Volume: 64
• Category: Article
• ISSN: 0016-6707
• DOI: 10.1007/bf00115339

✦ Synopsis

B-chromosomes were studied in two Spanish populations of Locusta migratoria. Both exhibit a high frequency of B-carrying individuals (75% and 94%). In both the B-chromosomes are mitotically unstable and they accumulate in the male germ line. The mean rate of accumulation is 28.5% in Bafios de la Encina and 31.9% in Carboneras. There are no significant differences in mean cell chiasma frequency and between-cell variance of chiasmata between follicles with different number of B's within individual males. Likewise, there are no significant differences in mean cell chiasma frequency and between-cell variance between males with and without supernumeraries. However, a significant negative correlation exists between mean chiasma frequency and the rate of accumulation.