犬は多種多様な動物である。 大きいのや小さいの、毛の長いのや短いの、鼻の長いのや短いの、そして足の長いの短いの．．．犬と一言で言ってもそれらは決してすべてひっくるめて語るには多様すぎる。 これらの犬種の特徴がどこからやってくるのか？この度ペットフードで有名なウォルサムの研究員とユタ大学のナショナル･ヒューマン･ゲノム･リサーチ研究所が共同で DNA 解析を使ってこの謎に挑んだ。 犬種の外見だけでなくその行動性質と気質についてもスポットをあて、148犬種から約13,000もの DNA 検体を取り、その DNA 配列一つ一つを厳密に比較していったというのだから、例えコンピューター処理とはいえ結構気の遠くなるような話である。 専門雑誌「Genetics」に掲載された研究結果によると、犬の成長後の大きさは6箇所の DNA 配列により決められていて、これらは5本の染色体に散在しているとか。さらには犬
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