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A genetic linkage map for the domesticated silkworm, Bombyx mori, based on restriction fragment length polymorphisms

Published online by Cambridge University Press:  14 April 2009

Jinrui Shi ,
David G. Heckel  and
Marian R. Goldsmith
Jinrui Shi
Affiliation:
Department of Zoology, University of Rhode Island, Kingston, RI 02881-0816, USA
David G. Heckel
Affiliation:
Department of Biological Sciences, Clemson University, Clemson, SC 29634-1903, USA
Marian R. Goldsmith
Affiliation:
Department of Zoology, University of Rhode Island, Kingston, RI 02881-0816, USA
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We present data for the initial construction of a molecular linkage map for the domesticated silkworm, Bombyx mori, based on 52 progeny from an F2 cross from a pair mating of inbred strains p50 and C108, using restriction fragment length polymorphisms (RFLPs). The map contains 15 characterized single copy sequences, 36 anonymous sequences derived from a follicular cDNA library, and 10 loci corresponding to a low copy number retrotransposon, mag. The 15 linkage groups and 8 ungrouped loci account for 23 of the 28 chromosomes and span a total recombination length of 413 cM; 10 linkage groups were correlated with established classic genetic maps. Scoring data from Southern blots were analysed using two Pascal programs written specifically to analyse linkage data in Lepidoptera, where females are the heterogametic sex and have achiasmatic meiosis (no crossing-over). These first examine evidence for linkage by calculating the maximum lod score under the hypothesis that the two loci are linked over the likelihood under the hypothesis that the two loci assort independently, and then determine multilocus linkage maps for groups of putatively syntenic loci by calculating the maximum likelihood estimate of the recombination fractions and the log likelihood using the EM algorithm for a specified order of loci along the chromosome. In addition, the possibility of spurious linkage was exhaustively tested by searching for genotypes forbidden by the absence of crossing-over in one sex.

Type
Research Article
Information
Genetics Research , Volume 66 , Issue 2 , October 1995 , pp. 109 - 126
Copyright
Copyright © Cambridge University Press 1995

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