Chromosome counts of 338 mouse zygotes at late prophase and metaphase of the first cleavage division revealed 96.4% diploidy, 1.8% hypodiploidy, 1.2% triploidy, and 0.3% tetraploidy. One additional anomaly might have given rise to an embryo mosaic for maternal but not paternal genes. In zygotes collected without colchicine administration to the mother, one… (More)
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