What Is the Genotype of a Person with Cystic Fibrosis

question 12

Multiple Choice

What is the genotype of a person with cystic fibrosis?

• A) The genotype includes two mutant CFTR genes,one each on the homologous chromosomes for chromosome 7.
• B) The genotype includes one mutant CFTR gene and one normal gene,one each on the homologous chromosomes for chromosome 7.
• C) The genotype includes two mutant CFTR genes,both on a single homologous chromosome 7;the other homologous chromosome 7 is normal.
• D) The genotype includes only one homologous chromosome 7;the second chromosome 7 is missing.
• E) The genotype includes 2 additional chromosomes with the mutant CFTR gene,making a total of 25 chromosomes.

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