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After graduation, you and 19 friends build a raft, sail to a deserted island, and start a new population, totally isolated from the world. Two of your friends carry(that is, are heterozygous for) the recessive cystic fibrosis allele(c), which in homozygotes causes cystic fibrosis - assuming that the frequency of this allele does not change as the population grows(Hardy-Weinberg Equilibrium), what will be the instance of cystic fibrosis on your island?
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