家蚕新規突然変異清水褐卵に関する遺伝学的解析
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(9) In 1995, a new brown egg mutant was discovered in one race of the domestic silkworm, Bombyx mori, which has been held at the National Institute of Agrobiological Science. The mutant resources were maintained in recessive genes and showed typical maternal inheritance which had been reported in the mutant, b-1. Complementation tests revealed that the mutant gene shared an allele of the well-described brown egg mutant, b-2. Hence, the newly discovered gene was named b-2 s , and mapped on the 6 th chromosome (29.1 cM). On the other hand, in the reciprocal cross experiment between b-2 s and b-2 na, F1 and F2 moths produced only brown eggs, while F3 moths produced normal egg color batches separated from the mutant batches. The segregation of the normal eggs may be derived from a recombination of the genes. The recombination rate of between b2 s and b-2 na was calculated at approximately 1.85 cM. National Institute of Agrobiological Sciences (NIAS), Kobuchisawa-chyou 6585, Kitakoma-gun, Yamanashi 408-0044, Japan Key words: maternal inheritance, b-2, b-2 na, maternal brown egg of Shimizu, b-2 s, pseudo allele, Bombyx mori. @ A A 8 /01234567BCDEF GH A IJKLBMBNOPQROMSTUVWXY BKLZ[B\]^_`abcdefghij defklmnWXYBKLefko[ oBp "d^qSrstu^\vefwa^xyzW{ | [ o}%~gip"efklmiY oQzWBlKL[ ozWX[ o[ ZV>B A @^~hiYo ^biX[ o[ Bp"efklmn r_`ab[`cdefghi[ oBp" ^qSrzW{| R 9Z rKLN OBMobnWXzIz lZKLNOB^ LNOQUVWXYBNO^x zWLNOZ ¡B{| [ o [ oB¢lB£¤^\v¥¦zWo§UVWX ¨B£¤©Zª @ « ¬ lmnWX[ Z[ o ½. «. ½½ 'ëì ¼ «. YB56B%ZáwÒæ ¼ 56 Î . lÀÁzWX P NO=R NBLzWLgRNOo
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