[求救] D1S80基因的問題!

看板Biotech作者 (Wengda)時間15年前 (2010/08/13 14:48), 編輯推噓0(007)
留言7則, 4人參與, 最新討論串1/1
大家好: D1S80這個基因是為了要Fingerprinting. 這個基因位於chromosome1. 問題如下: Knowung that there are 29 different alleles of D1S80, how many different classes of homozygotes exist? How many duggerent classes of heterozygotes exist? It was stated earlier that 435 different D1S80 genotypes are possible. How was this number obtained ? 第一個問題是29嗎? 第二個問題是29乘以28嗎? 第三個435就完全不懂了 ! 有哪位神人大大可以解答 ! 還有一題: The sizes of the PCR products of the D1S80 locus in one family 531 and 643 bp in the mother and 435 and 531 bp in the father. What are all possible fingerprints their children could have ? 謝謝各位大大了 >< -- 我愛妳 用生命的愛 ~ -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 203.64.80.73

08/13 14:56, , 1F
(29+1)x29/2
08/13 14:56, 1F

08/13 16:01, , 2F
可以請問為什麼 要+1嗎 ?
08/13 16:01, 2F

08/13 16:02, , 3F
除以2 應該是會有相同的 所以要減半 ?!
08/13 16:02, 3F

08/14 16:13, , 4F
[29*(29-1)]/2+29=435
08/14 16:13, 4F

08/16 02:04, , 5F
第一題29第二題C(29取2)
08/16 02:04, 5F

08/16 02:06, , 6F
C(29取2)=29!/(29-27)!*27!=1*2*...*29/1*2*1*2*...*27
08/16 02:06, 6F

08/16 02:07, , 7F
=28*29/2=406
08/16 02:07, 7F
文章代碼(AID): #1CPEhQAK (Biotech)