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Unequal X Chromosomes in Bradysia Hygida (Diptera:Sciaridae) Females: Karyotype Assembly and Morphometric Analysis

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Abstract

The mitotic chromosomes of Bradysia hygida(Diptera:Sciaridae) neuroblast cells are described together with their morphometric data. Giemsa-stained neuroblast chromosomes from female and male larvae confirm the chromosome number of this species, 2n = 8 (XX) and 2n = 7 (XO), respectively. The karyotype assembly reveals two metacentric autosomic pairs, the A and B chromosome; a subtelocentric, the C chromosome, the smallest one; and a sexual unequal metacentric pair, X chromosome, in female karyotype and a one sexual metacentric X chromosome in male. The implications of the unequal X chromosome pair are discussed.

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Authors and Affiliations

  1. Departamento de Biologia Celular e Genética, Universidade Estadual de Maringá, Maringá, Paraná, 87020-900, Brasil

    Alex Rodrigues Borges & Vanessa Pinatto Gaspar

  2. Departamento de Biologia Celular e Genética, Universidade Estadual de Maringá, Maringá, Paraná, 87020-900, Brasil

    Maria Aparecida Fernandez

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  1. Alex Rodrigues Borges
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  2. Vanessa Pinatto Gaspar
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  3. Maria Aparecida Fernandez
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Borges, A.R., Gaspar, V.P. & Fernandez, M.A. Unequal X Chromosomes in Bradysia Hygida (Diptera:Sciaridae) Females: Karyotype Assembly and Morphometric Analysis. Genetica 108, 101–105 (2000). https://doi.org/10.1023/A:1004016809267

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