Practice: Cystic Fibrosis Phenotype Probability Cystic fibrosis is a recessive …

Practice: Cystic Fibrosis Phenotype Probability

Cystic fibrosis is a recessive trait in humans. The gene that causes this disease is not located on the sex chromosomes. In a cross between a father who has cystic fibrosis and a mother who is heterozygous for the gene, what is the probability that their first three children will have the abnormal phenotype?



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