| doubly heterozygous | In the analysis of linkage between two loci, denoting that genotype in which a parent is heterozygous at both loci, the state that on average contains the maximum information about the linkage. (05 Mar 2000) |
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| heterozygous | Containing two different alleles of the same gene. Compare: homozygous. (09 Oct 1997) |
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| doubly armed suture | A suture with a needle attached at both ends. Synonym: cobbler's suture. (05 Mar 2000) |