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- FIGURE 1-10. (A) RFLPs. A diagram of human chromosome 7 shows the
- position of the met protooncogene at 7q31. The sequence TCGA is the
- recognition sequence of the TaqI restriction enzyme. TaqI generates a
- 7.5-kb fragment in allele 1 and, due to an internal site in allele 2,
- a 4- and 3.5-kb fragment in allele 2. The probe is positioned within
- the 4-kb fragment and detects the 7.5- and 4-kb fragments. (B) Use of
- an RFLP in genetic diagnosis. The met gene is tightly linked to the CF
- gene; they are therefore almost always inherited together. In this
- family, allele 1 is on the CF chromosome and the affected children
- (filled symbols) have a 1/1 genotype. Individuals with a 1/2 genotype
- are unaffected carriers and 2/2 children are unaffected noncarriers.
-