2021HSCMultiple choice

Q10

1 mark

Question

Cystic fibrosis is an autosomal recessive disorder caused by mutations in the CFTR gene. Many different recessive alleles cause cystic fibrosis. The four most common alleles of the CFTR gene and their frequencies in the Australian population are shown in the table. What will be the most common genotype of cystic fibrosis patients in Australia?
A. a1/a1
B. a1/a2
C. A/a1
D. A/A

Try the question before revealing the answer.

Syllabus alignment

Module 5 · HeredityWorking Scientifically

Genetic VariationInterpret inheritance patterns, pedigrees and Punnett squares to model genotype combinations.
Genetic VariationAnalyse frequencies of population characteristics and single nucleotide polymorphisms.

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