caa a22 4500 386392625 CHVBK 20180307112124.0 cr unu---uuuuu 161130e198912 xx s 000 0 eng 10.1017/S0016672300028664 doi S0016672300028664 pii (NATIONALLICENCE)cambridge-10.1017/S0016672300028664 Relationship between chromosome content and nuclear diameter in early spermatids of Drosophila melanogaster [Elektronische Daten] We have studied, using light microscopy, the relationship between chromosome content and nuclear diameter in early spermatids of males carrying different combinations of wild-type and compound chromosomes in Drosophila melanogaster. By using these genotypes we have been able to observe spermatid nuclei bearing various numbers of chromosomes ranging from only one sex chromosome and no major autosomes to almost twice the normal chromosome complement. We have found that variations in the chromosome content are accompanied by increasing the variance in early spermatid nuclear diameter; the more gametic classes produced, the higher the variance of nuclear diameters. These results indicate that measuring nuclear diameters in early spermatids represents a useful way to estimate the levels of meiotic non-disjunction and thereby to improve the characterization of lethal or male sterile mutants in which analysis of meiotic chrosome non-disjunction cannot be achieved by conventional genetic methods. Copyright © Cambridge University Press 1989 González Cayetano Centro de Biología Molecular (CSIC-UAM), Universidad Autónoma de Madrid, 28049 Madrid, Spain Casal José Centro de Biología Molecular (CSIC-UAM), Universidad Autónoma de Madrid, 28049 Madrid, Spain Ripoll Pedro Centro de Biología Molecular (CSIC-UAM), Universidad Autónoma de Madrid, 28049 Madrid, Spain Genetical Research Cambridge University Press 54/3(1989-12), 205-212 0016-6723 54:3<205 1989 54 GRH https://doi.org/10.1017/S0016672300028664 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0016672300028664 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- González Cayetano Centro de Biología Molecular (CSIC-UAM), Universidad Autónoma de Madrid, 28049 Madrid, Spain NATIONALLICENCE 700 1- Casal José Centro de Biología Molecular (CSIC-UAM), Universidad Autónoma de Madrid, 28049 Madrid, Spain NATIONALLICENCE 700 1- Ripoll Pedro Centro de Biología Molecular (CSIC-UAM), Universidad Autónoma de Madrid, 28049 Madrid, Spain NATIONALLICENCE 773 0- Genetical Research Cambridge University Press 54/3(1989-12), 205-212 0016-6723 54:3<205 1989 54 GRH CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge