188-ƾ

ȻҲǵġ˲ſ⡱߷ĵ˼---ɽ---麣ͼºߣԼӰɻά޹Ҳ֮Ӵҹ2019꽫»Ͷת

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188-ƾ

ߣÿӦս3 Դ̼˴ε 7099 ʱ䣺2013-9-6 19:03:11 壺С [ ӡ ] [ ر ]

̸Եؼ

ؽѧ 223600

     ժҪ֪ʶǽѧеصѵ֮һ,ҲǸ߿Ŀ֪ʶΪڿԴʱܿٽ,ڽѧܽ˼ӹɡ
   
ؼʣ  ٽ  

ڸ߿֪ʶŴм֪ʶ֮һҲǽѧеصѵ֮һ漰DNAĸƣת¼ͷ롣DNA֮ľһ,ʣʡʣ˫.णडणǵ,ֻԲ2,RNAणλ,λ,ԼԹΪATRNAΪAU.GCԡΪڿԴʱܿٽ,ڽѧܽ¼ӹ,ֹ:
   
ӹһ˫DNAеļȣA=T,C=GDNAв֮Ϊ50A+C=G+T=A+G=C+T=50%A+G+T+G

1.ij˫DNAļ,ʵķռ22,ôवķռ٣
  
ļ,˫DNA֮ӦΪ50,ռ28
 
ʽѵ1ijDNA˫,P,ռȫıΪN/MM>2NDNAкǶ٣PM/2N- P
   
ӹɶDNAһе֮͵ıֵһһֵĵУA+C/T+GıֵΪnУA+C/T+GıֵΪ1/n
2.DNAһУA+G/T+C=0.4,ڻDNAзֱǶ٣

ʲ,,ݹɶ,0.4ĵ2.5ָݹһ,˫,,ֵΪ1ֱ2.5 1
ʽѵ2˫DNA,T+C/A+G һϵı0.5ʱ,һDNA,ֱӦֱǶ٣2 1
   
ӹDNAл֮͵ıֵÿһеһֵ,ʹRNAеӦϱֵȡ
3. DNAһA+T/G+C =0.4,DNAзֱǶ٣ʹRNAеģA+U/C+G
,,ݹ,ֵڻDNAоΪ0.4˵: ऻ֮ռ˫İٷҲһռеİٷ,Ƶԡ
ʽѵ3һ˫DNA,ʺ֮ռ56,мռ24,ôռ٣20
   
ӹDNA˫,ijּa,n,üķüԵļķ,Ҳڣ2n-1anθüΪ2n-1a
4.ij˫DNAй1400,һA+T/G+C =2:5,DNAιǶٸ
Ϊ2nʾnDNA,1ʾ൱ԭеǸDNA,ӦʽĹؼa,ʾĺּԭDNAеĿӦ=200,ٸݹ,Ϊ600
ʽѵ4ijDNA4000,֪ʺ֮ռ60,ôDNA2Ƕ٣400
   
ӹڿƵʺϳɵת¼ͷģ,ģԼʹRNA,Ӧļڱкıֵȵ
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