Rapid suppression of drive for a parasitic B chromosomePerfectti F. · Corral J.M. · Mesa J.A. · Cabrero J. · Bakkali M. · López-León M.D. · Camacho J.P.M.
Departamento de Genética, Universidad de Granada, Granada (Spain)
The persistence of parasitic B chromosomes in natural populations depends on both B ability to drive and host response to counteracting it. In the grasshopper Eyprepocnemis plorans, the B24 chromosome is the most widespread B chromosome variant in the Torrox area (Málaga, Spain). Its evolutionary success, replacing its ancestral neutralized B variant, B2, was based on meiotic drive in females, as we showed in a sample caught in 1992. In females collected six years later, mean B24 transmission ratio (kB) was 0.523, implying a very rapid decrease from the 0.696 observed in 1992. This shows that B24 neutralization is running very fast and suggests that it might most likely be based on a single gene of major effect.
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