Abstract
In the grasshopper Eyprepocnemis plorans familial and individual genotypes have significant effects either on chiasma frequency or on bivalent length; the effect of B chromosomes depends on the particular family considered which derives in the absence of an overall effect of supernumeraries. This study confirms previous reports in that there is a significant positive correlation between chiasma frequency and bivalent length operating at a cellular rather than specific bivalent level. Nevertheless, the correlation between both variables is scarcely affected when the contributions of the different factors are eliminated. In addition, the effects of B chromosomes within the different families on chiasma frequencies are not parallel to the correspondent effects on bivalent length. These facts indicate that, despite such correlation, the influence of B chromosomes or familial and individual genotypes on chiasma frequency does not operate through changes in chromosome length at first meiotic prophase.
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Cano, M., Henriques-Gil, N., Arana, P. et al. The relationship between chiasma frequency and bivalent length: Effects of genotype and supernumerary chromosomes. Heredity 56, 305–310 (1986). https://doi.org/10.1038/hdy.1986.51
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DOI: https://doi.org/10.1038/hdy.1986.51
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