Summary
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1.
Cytological studies have been carried out during spermatogenesis of fifteen species.
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2.
A peculiar synizesis phase occurs normally in the early prophase stage of primary spermatocytes.
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3.
The homologous chromosomal threads undergo a longitudinal pairing during synizesis.
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4.
Typical diplotene stage has not been discovered; instead, a diffuse phase intervenes between pachytene and diakinesis.
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5.
In the diakinetic bivalents the presence of one or two completely terminalized chiasmata can be justified. There are a few instances, however, where certain bivalents are precociously resolved intou nivalents disclosing most probably a failure of chiasma-formation in them. The question, therefore, whether definite chiasmata are formed in Lepidoptera cannot be answered with absolute certainty.
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6.
By a comparative study of the chromosomal garnitures in the congeneric forms investigated herewith, such as Vanessa indica and V. kashmirensis, and Earias insulana and E. fabia, it has been concluded that a number discrepancy in related species must be attributed to fusions and fragmentations of original chromosomes and not to polyploidy.
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7.
A male homogamety occurs in all the species studied.
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8.
Any relationship between a sex-chromosome pair and the nucleolus could not be established.
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Gupta, Y. Chromosomal studies in some Indian Lepidoptera. Chromosoma 15, 540–561 (1964). https://doi.org/10.1007/BF00319989
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DOI: https://doi.org/10.1007/BF00319989