サルでもわかる検定交雑 – やさしく学べる遺伝学

検定交雑(testcross)は劣性のホモ接合体との交配のことです。検定交配と呼ばれることもあります。劣性は小文字のアルファベットで表わされます。aaやbbという遺伝子型です。下の図のような場合です。

劣性のホモ接合体の個体と交配させることで、ある形質が優性であるか劣性であるかをテストすることができます。

検定交雑では劣性ホモ接合体と交配させる

ちなみに、ヘテロ接合体とホモ接合体の交配は戻し交配(backcross)と呼ばれます。検定交雑は、戻し交配において、ホモ接合体が劣性ののときの呼び方です。

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