DNA, genes and inheritance

DNA, genes and inheritance Quiz

IB MYP Sciences: Quiz

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5 questions, one answer each

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  1. 1. A person has the genotype Tt, where T is dominant. Which word describes this genotype?

    • A. Homozygous dominant
    • B. Homozygous recessive
    • C. Heterozygous
    • D. Phenotype

  2. 2. Two heterozygous parents (Aa) have children. What is the probability a child is aa?

    • A. 0%
    • B. 50%
    • C. 75%
    • D. 25%

  3. 3. Which of these is a phenotype?

    • A. Bb
    • B. Brown eyes
    • C. bb
    • D. An allele

  4. 4. What is a gene?

    • A. A cell in the nucleus
    • B. A coiled structure made of many chromosomes
    • C. A different version of a section of DNA
    • D. A section of DNA that carries instructions for a characteristic

  5. 5. A recessive characteristic appears in a child of two parents who do not show it. What must be true of the parents?

    • A. Both are carriers
    • B. Both are homozygous dominant
    • C. One is homozygous dominant
    • D. Both are homozygous recessive

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