家蚕遗腹卵率的遗传参数分析

用６个原种按完全双列杂交法安排试验，对组配的３６个杂交组合的试验结果，用数量遗传学及统计学的方法进行了分析。家蚕遗腹卵的发生，在原种间、杂种间均有一定的差异性。以日系杂交原种有偏高的倾向。造卵数与遗腹卵率的相关分析表明，蚕的遗腹卵率并不依造卵数的增多而增加。家蚕亲本的遗腹卵率多时，其杂交后代的遗腹卵率也高，遗腹卵的遗传表现为超显性，显性效应大于加性效应，亲本以显性基因频率大于隐性基因的频率，推测其基因数目至少有３对。

ANALYSIS OF GENETIC PARAMETERS ON UNLAID EGG RATIO OF THE SILKWORM(Bombyx mori)

Analysis with methods of quantitative genetics and statistics was done on thereults of 36 hybrid combinations from 6 parental varieties in complete dialledcrossing.There was variation in the occurrence of unlaid egg both among par-ents and F1.The number of the unlaid eggs depended on the geneticcombination. The figure in Japanese hybrid tended to be higher.The analysisshowed that there was no corelationship between fecundity and unlaid egg ra-tio.If the unlaid egg ratio was high in the parents,the same would happen intheir off springs.The inheritance of the unlaid egg ratio is super-dominant,withdominant effect greater than additive effect.The frequency of donunant genes washigher than that of recessive genes in the parents.It is soggested that the nulnber ofgenes is 3 pairs.