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KMID : 1041219790210020001
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Journal of Sericultural and Entomological Science
1979 Volume.21 No. 2 p.1 ~ p.6
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Genetic Studies on Some Silkworm Characters by the Diallel Cross I. Degrees of Dominances and Gene Distributions
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Chang Kwon-Yawl
Han Kyung-Soo
Min Byung-Yawl
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Abstract
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Diallel crosses among six silkworm varieties were used as the materials. by the randomized block design, and diallel cross analyse were conducted to determine the relationships between parents and their Fhybrids. The six parents and their 30 Fcrosses were evaluated for five quantitative characters in each female and male silkworms. All methods utilized were similar in detecting lines giving unexpected performance in the Fgeneration. Mean values of total cocoon weight and weight of cocoon layer of female silkworms were more than those of male silkworms, but mean values of cocoon layer ratio of female silkworms were less than those of male silkworms in both parents and 30 Fhybrids. Over dominance was exhibited by total cocoon weight and weight of cocoon layer, and partial dominance was exhibited by periods (days) of larval stage, periods (days) of 5th instar and cocoon layer ratio (weight of cocoon layer/total cocoon weight). Furthermore, it was recognized that varieties F (Yunil) and E (Kyung-choo) were recommendable varieties as the parents in breeding of silkworms for increasing the total cocoon weight and weight of cocoon layer, etc.
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