South Africa Matric · Life Sciences

Genetics and inheritance

19 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 19 questions

  1. Different forms of the same gene are called
  2. An individual with genotype Tt for a gene is described as
  3. Two heterozygous tall pea plants (Tt × Tt) are crossed. What is the probability that an offspring is short (tt)?
  4. A heterozygous tall plant (Tt) is crossed with a short plant (tt). What is the ratio of tall to short offspring?
  5. What is the purpose of a test cross?
  6. A red-flowered snapdragon is crossed with a white-flowered snapdragon and all offspring are pink. This is an example of
  7. A man with genotype IᴬIᴮ has which blood group?
  8. A mother with genotype Iᴬi and a father with genotype Iᴮi have children. Which blood groups are possible?
  9. The expected phenotypic ratio of a dihybrid cross between two heterozygous parents (AaBb × AaBb) is
  10. In a pedigree, two unaffected parents have an affected child. This shows that the condition is
  11. The genotype of an organism refers to
  12. How many chromosomes does a person with Down syndrome have in each body cell?
  13. Which pair of sex chromosomes is found in a normal human male?
  14. A woman who is a carrier for haemophilia (XᴴXʰ) has children with an unaffected man (XᴴY). What is the probability that a daughter is a carrier?
  15. A karyotype is
  16. Two pink-flowered snapdragons (incomplete dominance) are crossed. What is the expected phenotypic ratio of their offspring?
  17. A woman with blood group O and a man with blood group AB have children. Which blood groups are possible in the children?
  18. A person has 45 chromosomes in each body cell, with a single X chromosome and no Y chromosome. This person has
  19. A mutation occurs in a skin cell of an adult. Why is it not passed on to the next generation?

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