When the cystic fibrosis gene was discovered in 1989,only one mutation was described,and a diagnostic test developed to detect it.Over the years,as more mutations were discovered,they were added to the test panel.Today,most pregnant women are offered a CF test that detects 100 or so alleles,although more than 1600 mutations have been discovered.These facts illustrate

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The fact that over 1600 mutations have been discovered for the cystic fibrosis gene, but only 100 or so are detected in the current diagnostic test, indicates the presence of multiple alleles.

When the Cystic Fibrosis Gene Was Discovered in 1989,only One