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3. In certain parts of Africa where malaria is prevalent there is an apparent advantage to...

3. In certain parts of Africa where malaria is prevalent there is an apparent advantage to being heterozygous for the recessive allele that causes sickle-cell anemia. Suppose a couple, both heterozygous for this allele, plans to have four children. What is the probability that all four will be heterozygous for the sickle-cell allele (assuming that none are from multiple births)?

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