Karyological Evidence of Female Heterogamety in the Mosquitofish ...

testes, and spleen. The female karyotype invariably includes a single distinctly large metacentric chromosome, absent in all males examined, which strongly indicates female heterogamety of the "WZ" type. The smallest acrocentric, also without a homomorph, probably complements this large W; in the male the smallest pair of similar acrocentrics (ZZ?) ................
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