Lesson 4.6.1.6

4.6.1.6 Genetic inheritance Quiz: AQA Biology, Unit 6

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.6.1.6, Genetic inheritance: 20 multiple choice questions for the AQA GCSE Biology (8461), Unit 6: Inheritance, variation and evolution, written with Revision Ninja.

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The 20 questions

  1. What biological term describes a specialised sex cell, such as a sperm or egg cell?

    • Gamete
    • Zygote
    • Chromosome
    • Allele

  2. What biological term describes different versions of the same gene?

    • Genotypes
    • Phenotypes
    • Alleles
    • Chromosomes

  3. How many copies of a dominant allele are needed for it to be expressed?

    • Two
    • Zero
    • One
    • Three

  4. How many copies of a recessive allele must be present for it to be expressed?

    • Zero
    • One
    • Three
    • Two

  5. An organism with two identical alleles for a trait is described as:

    • Dominant
    • Recessive
    • Homozygous
    • Heterozygous

  6. An organism with two different alleles for a trait is described as:

    • Haploid
    • Homozygous
    • Heterozygous
    • Recessive

  7. What term describes the observable physical characteristics of an organism?

    • Allele
    • Genotype
    • Phenotype
    • Karyotype

  8. Which characteristic in mice is controlled by a single gene?

    • Fur colour
    • Tail length
    • Eye size
    • Body mass

  9. Red-green colour blindness in humans is controlled by how many genes?

    • Multiple genes
    • Single gene
    • No genes
    • Three genes

  10. Which mathematical idea is used to predict the results of a single gene cross?

    • Probability
    • Percentage change
    • Standard deviation
    • Logarithms

  11. Which diagram is used to predict the outcomes of a genetic cross?

    • Punnett square
    • Food web
    • Rate graph
    • Circuit diagram

  12. In a cross between two heterozygous mice (Bb x Bb, with B dominant), what proportion of offspring are expected to be bb?

    • 1 in 4
    • 3 in 4
    • 1 in 2
    • 1 in 8

  13. What term describes the complete genetic makeup of an organism for a trait?

    • Genotype
    • Genome
    • Karyotype
    • Phenotype

  14. Which human sex chromosome combination determines a typical biological male?

    • YY
    • XX
    • XO
    • XY

  15. Which ratio is expected from a cross between two heterozygous parents for a single gene?

    • 3:1
    • 2:1
    • 9:3:3:1
    • 1:1

  16. What genotype describes unaffected parents who have a child with a recessive condition?

    • Both homozygous recessive
    • Both heterozygous
    • One homozygous recessive
    • Both homozygous dominant

  17. What controls the majority of phenotype features in an organism?

    • Multiple interacting genes
    • Single dominant genes
    • Chromosome count alone
    • Single recessive genes

  18. Which human sex chromosome combination determines a typical biological female?

    • YY
    • XX
    • XY
    • XXY

  19. Which term describes an individual with two different alleles for a specific gene?

    • Homozygous
    • Genotype
    • Phenotype
    • Heterozygous

  20. What type of event is the inheritance of alleles by individual offspring?

    • Independent chance event
    • Deterministic reaction
    • Predictable cycle
    • Guaranteed sequence

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