Abstract
This experiment was carried out to obtain a marked larvae in sex-limited inheritance, using F$_1$ hybrid Bo ok X Chun san introduced from Japan. Sequence of backcrossing has been done through the earlier generation with a recessive character of plain marked larvae. 1. It is noted that genotypic segregation of sex-limited larval marking was observed in F$_4$ generation; female possesses larval marking and male shows a plain marking. 2. Larval marking heredity follows a diagram of segregation with an expected genotype such as ♀ ： (W$.$＋p)/Z$.$P/P and ♂ ： Z/Z$.$P/P. 3. It is observed that dissociation was occurred to produce female with a genotype of W/Z$.$P/P in segregation ana selection. 4. Abnormal ratio of sexuality is observed in the course of segregation and segregation and analysis of it is continuously under way. 5, It is observed that the difference of qualitative characteristics between female and male obtained from the original variety shows the same tendency as the normal marked variety.
잠 육종용 기초품종으로 한성형잠을 얻고저 일본으로부터 도입된 교잡종 보옥$\times$춘산에 열성반문 희잠을 수대 Back crossing하여 다음 결과를 얻었다. 1. 한성형잠 목적형(♀ ：형반잠, ♂：희반잠)을 F$_4$에서 분리확인했다. 2. 목적형 Genotype은 ♀ ： (W.＋p)/Z.P/P, ♂ ： Z/Z.P/P로 반문의 유전은 분리계획 추정모식도와 일치했다. 3. 분리선발중 전좌염색체의 해이현상인 W/Z.P/P의 자잠이 나타났다. 4. 분리선발중 이상성비가 나타났으며 그의 기권에 대하여는 계속 추구중이다. 5. 분리 한성계통의 자웅잠의 계량형질의 차는 모품종보다 분리계통이 일반품종의 그것과 가까웠다.