| Budget Amount *help |
¥18,200,000 (Direct Cost: ¥14,000,000、Indirect Cost: ¥4,200,000)
Fiscal Year 2014: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2013: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000)
Fiscal Year 2012: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
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| Outline of Final Research Achievements |
Because sexually dimorphic traits show great diversity and such divergence can contribute to speciation, it is one of the fundamental questions in ecology and evolution what are the genetic mechanisms underlying diversification of sexual dimorphism. Here, we first conducted QTL mapping of variation in a sexually dimorphic trait, anal fin length, between a southern population and a northern population of medaka. The majority of QTL were age-specific. Different fins share only few QTL. QTL detected in males have smaller effects in females. These results indicate that genetic constraints derived from genetic correlations between ages, sexes or traits are resolved to some extent. We next conducted QTL mapping using a marine population and a stream population of threespine stickleback. We identified several significant QTL. We also established genetic engineering methods of sticklebacks, both transgenesis and knockout.
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