カイコのモザイク致死突然変異に関する遺伝学的研究

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タイトル別名
  • Genetical analysis of the mosaic lethal mutant in Bombyx mori.
  • カイコ ノ モザイク チシ トツゼン ヘンイ ニ カンスル イデンガクテキ ケ

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The genetical manner and characteristics of the mutant found from the Cre strain in Bombyx mori were estimated. The mutant laid spontaneously mosaic egg, and also simultaneously white color and normal color eggs. Those eggs can not be hatched.<br>The female moths were divided into two groups, and one is used for maintenance of the strain, the other is used for the test cross. We investigated the frequency of moths which laid mosaic eggs, the frequency of lethal batches in sibcross, the frequency of mosaic expression in next generation.<br>The mutant strain was mated with a normal strain (C108), then F1 and F2 progenies were investigated on the mosaic expression.<br>Furthermore, the male moths of the mutant strain were mated with C108, and the frequency of moths which laid unfertilized eggs was investigated.<br>We conclude that this mutant is controlled by a single recessive gene (designated as mosaic lethal gene: l-mo). Although moths homozygous for l-mo can copulate, female moths homozygous for l-mo lay mosaic eggs consisted of zygotic cell and androgenetic cell, male moths homozygous for l-mo decline for fertilization ability.

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