Inheritance of genes, alleles and cystic fibrosis Quiz
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5 questions, one answer each
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1. A man is heterozygous for a recessive allele and shows no symptoms. Which term describes him?
- A. Homozygous recessive
- B. Homozygous dominant
- C. Carrier
- D. Codominant
2. Red snapdragons crossed with white snapdragons give only pink offspring. What does this show?
- A. Complete dominance of red
- B. Incomplete dominance
- C. Recessive inheritance of pink
- D. A mutation in the offspring
3. Two unaffected parents have a child with CF. What is the probability that their next child is an unaffected carrier?
- A. 1 in 4
- B. 3 in 4
- C. 0
- D. 1 in 2
4. Which is the direct result of a faulty CFTR protein?
- A. Too much water enters mucus
- B. Chloride ions are not secreted into the mucus
- C. Excess pancreatic enzymes are made
- D. Cilia grow too long
5. Why are men with CF often infertile?
- A. The vas deferens is blocked or absent
- B. Their sperm cannot swim
- C. Their testes make no testosterone
- D. They produce too much semen