Inheritance and genetic crosses Quiz
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5 questions, one answer each
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1. Which genotype is homozygous recessive?
- A. TT
- B. Tt
- C. tT
- D. tt
2. Two heterozygous parents (Aa × Aa) have children. What is the expected ratio of dominant to recessive phenotype?
- A. 1 : 1
- B. 3 : 1
- C. 2 : 1
- D. 1 : 3
3. A baby's sex is decided by which parent's gamete?
- A. The father's sperm, which carries X or Y
- B. The mother's egg, which carries X or Y
- C. Both are always X
- D. Both are always Y
4. Two healthy parents have a child with cystic fibrosis. What are the parents' genotypes?
- A. FF and FF
- B. ff and ff
- C. FF and Ff
- D. Ff and Ff
5. A man with Huntington's disease (Hh) and an unaffected woman (hh) have a child. What is the probability that the child has the disease?
- A. 0%
- B. 25%
- C. 50%
- D. 100%