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Summary. Two chromosomally aberrant chicken embryos (16 to 18 hr of incubation) were found. One was trisomic for a large submetacentric chromosome, number 2 of the chicken karyotype. The second was a haploid whose cells contained thirty-nine chromosomes. The probable modes of origin and usefulness of the findings are briefly discussed.
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Fechheimer et al. (1968) studied this question.
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