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18. Cystic fibrosis is determined by an autosomal recessive allele in humans. A couple know they are both heterozygous carriers of this recessive allele. What is the probability
that their 2ndchild will have the disease?a) 1/4b) 1/2c) 1/3d) (1/4)2e) 9/16f) 3/4g) none of the above
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