Abstract
Under the assumption that benign ovarian teratomas in man arise parthenogenically from a germ cell by suppression of the second meiotic division, the distance of a gene from its centromere can be estimated from the observed proportion of heterozygous teratomas collected from heterozygous hosts. The frequency of heterozygous teratomas of heterozygous hosts is equivalent to the frequency of second division segregation at the gene locus which has been used for centromere-related mapping in fungal genetics for more than 40 years. Mapping functions useful for teratoma-based mapping in man are presented.
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