Summary
A male of Atractomorpha bedeli (2n♂ = 18 + X) was heterozygous for a complex translocation in which exchange involved three non-homologous chromosomes. Unaltered and altered chromosomes constituted special pairs each with proximal homologous segments (interstitial segments) and distal nonhomologous segments. Two of such pairs were “heteromorphic“ for unequal length of the distal non-homologous segments. Thus occurrence of a single crossing-over in the proximal segment resulted in equational AI separation for the distal inequality. A good conformity was found between formation of a chiasma in the proximal segment and equational AI separation for the distal inequality. Thus occurrence of a crossing-over corresponded to formation of a chiasma, supporting the view of the chiasmatype hypothesis.
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References
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Sannomiya, M. Relationship between crossing-over and chiasma formation in a translocation heterozygote of Atractomorpha bedeli (Acrididae, Orthoptera). Heredity 40, 305–308 (1978). https://doi.org/10.1038/hdy.1978.30
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DOI: https://doi.org/10.1038/hdy.1978.30
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