作者mkmai0802 (Wengda)
看板Biotech
标题[求救] D1S80基因的问题!
时间Fri Aug 13 14:48:51 2010
大家好:
D1S80这个基因是为了要Fingerprinting.
这个基因位於chromosome1.
问题如下:
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 ?
第一个问题是29吗?
第二个问题是29乘以28吗?
第三个435就完全不懂了 !
有哪位神人大大可以解答 !
还有一题:
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 ?
谢谢各位大大了 ><
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1F：→ crement:(29+1)x29/2 08/13 14:56
2F：→ mkmai0802:可以请问为什麽 要+1吗 ? 08/13 16:01
3F：→ mkmai0802:除以2 应该是会有相同的 所以要减半 ?! 08/13 16:02
4F：→ auxotroph:[29*(29-1)]/2+29=435 08/14 16:13
5F：→ fc01:第一题29第二题C(29取2) 08/16 02:04
6F：→ fc01:C(29取2)=29!/(29-27)!*27!=1*2*...*29/1*2*1*2*...*27 08/16 02:06
7F：→ fc01:=28*29/2=406 08/16 02:07