Abstract
A partially asynaptic individual of the grasshopperEuchorthippus pulvinatus (2n ♂ = 16 + X) was analysed at meiosis, using a Giemsa C-banding technique. Long chromosomes formed univalents less frequently than did medium and short ones. Homologues which succeeded in forming bivalents showed reduced chiasma frequency, the long chromosomes being affected by most. Changes in chiasma distribution were also observed. The presence of univalents at metaphase I seems to affect the function of the spindle, since most cells at the second division were unreduced. Cytokinesis was also subsequently suppressed in a great number of these products of restitution, resulting in the formation of diploid and tetraploid spermatids. Fifteen tetraploid metaphase I cells were also found in which pairing level and chiasma frequency were almost twice the average value in normal diploid individuals. The nature of this mutant is discussed.
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Santos, J.L. Differential meiotic behaviour of diploid and tetraploid cells in a partially asynaptic mutant. Chromosoma 99, 231–236 (1990). https://doi.org/10.1007/BF01731134
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DOI: https://doi.org/10.1007/BF01731134