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A human disease known as cystic fibrosis is inherited as a recessive trait. For example, the...

A human disease known as cystic fibrosis is inherited as a recessive trait. For example, the possible outcomes of a child inheriting cystic fibrosis genes are CC Cc cC cc if the child’s parents had one copy of each version of the gene so the probability of having a disease is ¼.

Find the probability that 3 out of 6 children of these parents will have a cystic fibrosis.

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