Multiple Choice
Which of the following characteristics is typically recessive?
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12. Meiosis
Genes & Alleles
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Is cystic fibrosis caused by a dominant or a recessive allele?
A
Incomplete dominant allele
B
Dominant allele
C
Codominant allele
D
Recessive allele
Verified step by step guidance1
Understand the concept of genetic inheritance: In genetics, alleles can be dominant or recessive. A dominant allele expresses its trait even if only one copy is present, while a recessive allele requires two copies to express the trait.
Learn about cystic fibrosis: Cystic fibrosis is a genetic disorder that affects the respiratory and digestive systems. It is caused by mutations in the CFTR gene.
Identify the inheritance pattern of cystic fibrosis: Cystic fibrosis is inherited in an autosomal recessive manner, meaning that a person must inherit two copies of the mutated CFTR gene (one from each parent) to exhibit the disease.
Differentiate between dominant and recessive alleles: A recessive allele, like the one causing cystic fibrosis, does not manifest in individuals who have only one copy of the allele. These individuals are carriers but do not show symptoms.
Conclude the inheritance pattern: Since cystic fibrosis requires two copies of the mutated allele to be expressed, it is caused by a recessive allele.
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