家蚕五种幼虫斑纹浓淡型间的遗传

以本研究室家蚕基因库保存遗传系统的幼虫斑纹为观察对象,发现暗色斑（P^M）．黑缟斑（P^S）．杲蚕（U）鹑斑（q)．褐圆斑（L）均存在斑纹浓淡程度不同且表型稳定的多型系统。根据杂交后能够识别浓淡型性状分离,将暗色斑分成浓型（P^M3)．中型（P^M2)和淡型（P^M1),黑缟斑分成浓型（P^S2)．淡型（P^S1),杲蚕分成浓型（U^2)和淡型（U^1）,鹑斑分成浓型（q^3)．中型(q^2)和淡型（q^1),褐圆斑分成浓型（L^2)和淡型（L^1)。同种斑纹内浓淡型间相互杂交,整体上均表现为等位基因的遗传模式,相对的浓型对淡型为显性,即：P^M3＞P^M2＞P^M1,P^S2＞PS1,U^2＞U^1,q^3＞q^2＞q^1,L^2＞L^1。

INHERITANCE BETWEEN DIFFERENT COLOR SHADES OF FIVE LARVAL MOTTLES IN BOMBYX MORI

Observation was made of the mottles on the body of silkworm (Bombyx mori ) genetic systems main- tained in the gene pool of the laboratory. Polymorphic systems were found to exist in moricaud (PM), stripe (PS),uras (U), quail (q) and multilunar (L) types,which showed different shades of the mot- tle color and appeared to be stable phenotypically. Based on the segregation in color shade in the crosses between dark and pale types, PM is divided into dark (PM3), intermediate (pM2) and pale (PM1) types, ps into dark (pS2) and pale (PS1) type, uzsa into dark (U2) and pale (U1) types, quial into dark (q3),intermediate (q2) and pale (q1) types, and multinunar into dark (L2) and pale (L1) types, Reciprocal hybridization between the dark type and the pale type in the same mettle pattern showed an al- lelic inheritance mode and dark type seemed to be dominant to the pale type, i.e. PM3 > PM2 > PM1,pS1, > pS2, U2 > U1,q3 > q2 > q1 and L2 > L1.