题目内容
About ____________ people have sickle cell disease in the US.
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Worldwide, more than ____________ infants are born with sickle cell disease.
Spinal muscular atrophy (SMA) is a group of inherited disorders that cause progressive muscle degeneration and weakness, which is caused by gene mutations in the ________ and VAPB genes.
Griffith's experiment, conducted in ________ by Frederick Griffith (1879-1941) who was a British medical officer, was one of the first experiments suggesting that bacteria are capable of transferring genetic information through a process known as transformation.
GeneticengineeringwasfirstpresentedattheSixthInternationalCongressofGeneticsheldin _______.
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