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2014年03月09日
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細胞分裂の仕組みと、染色体の数がイマイチです体細胞分裂と減数分裂。全部まとめて書いてくださィ!お願いしやす!

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  • KAITAKU より:

    Mochizuki

    体細胞分裂では、1つの細胞に含まれる染色体の数は変化しない。
    これは、分裂前に細胞内で染色体が複製されて一旦は2倍になり、それが2つの細胞に分かれていくため、元の細胞と同じ染色体の本数となる。

    減数分裂は、生殖細胞(動物なら精子と卵、植物なら精細胞と卵細胞)ができるときだけに起こる細胞分裂で、染色体の数が半分になる。
    染色体が半分しかない精子と、染色体が半分しかない卵が、受精することによって、染色体の合計が元に戻るという仕組みです。

    いよいよ明日が入試。取りきっておいで!
    落ち着いてな!

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