Unformatted text preview: York, the smallest visible deletion (about 4Mb) would represent about an 8 km gap and that on this scale, the average gene would be about 30 m long. So even the smallest gap will usually contain many genes. About 20% of conceptions have some sort of chromosomal disorder but because of the lethal effects of such disorders, the number actually born is only about 0.6%. chromosome abnormalities in early spontaneous abortions Defect frequency triploidy 10% tetraploidy 5% trisomy 30% Turner syndrome (45 X) 10% other 5% Total 60% A wonderful resource for the next section is the University of Tokyo Medical School where someone has laboured long and hard to make all sorts of moving images to explain chromosome rearrangements...
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- Fall '10
- Chemistry, Chromosome Abnormalities, marmoset chromosome