Genetic variation Quiz
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5 questions, one answer each
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1. Which of the following best describes the relationship between a gene and an allele?
- A. An allele is a specific version of a gene at a particular locus on a chromosome
- B. A gene and an allele are identical terms used interchangeably in genetics
- C. A gene is found on an allele, not the other way around
- D. An allele codes for a single protein, whilst a gene codes for multiple proteins
2. In a monohybrid cross between a homozygous dominant organism (AA) and a homozygous recessive organism (aa), what is the genotypic ratio of the F₁ generation?
- A. 1:1 ratio of AA to aa
- B. All offspring are Aa (100% heterozygous)
- C. 3:1 ratio of dominant to recessive phenotypes
- D. 2:2 ratio of homozygous to heterozygous
3. A woman with blood group AB (I^A I^B) and a man with blood group O (ii) have a child. Which blood group is impossible for their child to have?
- A. Blood group A
- B. Blood group B
- C. Blood group AB
- D. Blood group O
4. Colour blindness is an X-linked recessive trait. A carrier female (X^N X^c) has children with a colour-blind male (X^c Y). What percentage of their daughters are expected to be colour blind?
- A. 0%
- B. 25%
- C. 50%
- D. 100%
5. A family pedigree shows that haemophilia (X-linked recessive) skips generations, appearing in a grandmother, absent in her daughter, but present in her grandson. Which statement best explains this pattern?
- A. The daughter is homozygous recessive but shows no symptoms due to incomplete dominance
- B. The daughter is a heterozygous carrier who passed the recessive allele to her son
- C. Haemophilia underwent a new mutation in the grandson
- D. The grandmother's X chromosome was inactivated in the daughter, preventing expression