1細胞の全DNAの長さは2 m=2*10^6 umで染色体数は46本ですから1染色体あたりの平均の長さは
2 m/46=2*10^6 um/46=0.0435*10^6 um =4.35*10^4 um
これを染色体の平均の長さ5 umで割ると 4.35*10^4/5=0.87*10^4 =8.7*10^3 (倍)
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