Genetic crosses and inheritance Quiz
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5 questions, one answer each
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1. A man and a woman both have normal skin pigmentation and have an albino child. What does this show?
- A. The allele for albinism is dominant
- B. The allele for albinism is recessive and both parents are carriers
- C. The allele for albinism is on the Y chromosome
- D. The child has a new mutation
2. Which phenotype ratio is expected from a cross between two double heterozygotes with unlinked genes?
- A. 3:1
- B. 1:1:1:1
- C. 9:3:3:1
- D. 1:2:1
3. A test cross gives mostly parental types and few recombinants. What does this suggest?
- A. The genes are on different chromosomes
- B. The genes are linked
- C. The genes are sex linked
- D. The alleles are codominant
4. A carrier mother and an unaffected father have a son. What is the probability that he has haemophilia?
- A. 0
- B.
- C.
- D. 1
5. A chi-squared test has 4 classes, so degrees of freedom are:
- A. 2
- B. 3
- C. 4
- D. 5