Monohybrid Inheritance Quiz
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5 questions, one answer each
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1. What does 'heterozygous' mean?
- A. Having two identical alleles of a gene
- B. Having two different alleles of a gene
- C. Having no alleles of a gene
- D. Having only recessive alleles
2. When is a recessive allele expressed in the phenotype?
- A. Whenever it is present in the genotype
- B. Only when no dominant allele of the gene is present
- C. Only in males
- D. Only during meiosis
3. Two heterozygous pea plants (Bb) for a single gene are crossed. What phenotypic ratio would you expect in the offspring?
- A. 1:1
- B. 3:1
- C. 1:2:1
- D. 9:3:3:1
4. A plant showing the dominant purple-flower phenotype is crossed with a homozygous recessive white-flowered plant. All the offspring have purple flowers. What can be concluded about the genotype of the purple-flowered parent?
- A. It was heterozygous
- B. It was homozygous dominant
- C. It was homozygous recessive
- D. No conclusion can be drawn
5. A pedigree diagram shows two unaffected parents who have one child affected by a recessive genetic condition. Using genetic diagram principles, what does this tell you about the parents' genotypes?
- A. Both parents must be homozygous recessive
- B. Both parents must be heterozygous carriers of the recessive allele
- C. One parent must be homozygous dominant and the other homozygous recessive
- D. The condition cannot be genetic if the parents are unaffected