Abstract
A polymorphism for heterochromatic supernumerary segments in the M7 and S8 chromosomes has been found in three natural populations of the grasshopper Euchorthippus pulvinatus. In two out of three populations the presence of S8 segments on the male side leads to a significant increase in mean cell chiasma frequency compared to individuals lacking segments. The M7 segment also enhances chiasma frequency in the single population studied. Neither segment produces any effect on the female side. Both segments modify chiasma distribution in the carrier bivalents with chiasmata preferentially formed furthest from the segment, at least in heterozygotes. In M7 heterozygotes this effect is more pronounced in males than in females. M7 basic and segment homozygotes have similar chiasma distribution patterns while the distribution patterns differ in S8 homozygotes.
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Santos, J. The effect of supernumerary segments on recombination in Euchorthippus pulvinatus (grasshopper): a comparative study between sexes and populations. Heredity 70, 130–134 (1993). https://doi.org/10.1038/hdy.1993.21
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DOI: https://doi.org/10.1038/hdy.1993.21
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