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JAMB Biology questions: Heredity and variation

36 questions with answers and explanations. Tap an option to check yourself.

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All topicsCell structure and organisation · 30Cellular activities · 32Co-ordination and control · 31Ecology · 38Evolution · 27Excretion · 30Growth · 27Heredity and variation · 36Nutrition · 34Reproduction · 33Respiration · 30Support and movement · 28Transport · 30Variety of organisms · 32

  1. Question 1· Heredity and variation· JAMB

    Colour blindness is commoner in males because the gene is

    Explanation and discussion

  2. Question 2· Heredity and variation· JAMB

    What genotypes are possible among the children of an AS father and an AA mother?

    Explanation and discussion

  3. Question 3· Heredity and variation· JAMB

    The number of chromosomes in a normal human body cell is:

    Explanation and discussion

  4. Question 4· Heredity and variation· JAMB

    Two parents both have blood group A with genotype AO. What is the probability that their child has blood group O?

    Explanation and discussion

  5. Question 5· Heredity and variation· JAMB

    A couple already has three daughters. What is the probability that their fourth child will be a boy?

    Explanation and discussion

  6. Question 6· Heredity and variation· JAMB

    The observable characteristics of an organism make up its

    Explanation and discussion

  7. Question 7· Heredity and variation· JAMB

    A sudden, heritable change in a gene or chromosome is called

    Explanation and discussion

  8. Question 8· Heredity and variation· JAMB

    Sickle-cell anaemia is caused by:

    Explanation and discussion

  9. Question 9· Heredity and variation· JAMB

    A gene that shows its effect only when two copies are present is described as

    Explanation and discussion

  10. Question 10· Heredity and variation· JAMB

    Mendel's first law is the law of

    Explanation and discussion

  11. Question 11· Heredity and variation· JAMB

    Gregor Mendel carried out his experiments on heredity using the

    Explanation and discussion

  12. Question 12· Heredity and variation· JAMB

    Mendel's first law states that

    Explanation and discussion

  13. Question 13· Heredity and variation· JAMB

    A father has blood group A (genotype AO) and the mother has blood group B (genotype BO). Their children could have blood group(s)

    Explanation and discussion

  14. Question 14· Heredity and variation· JAMB

    Colour blindness is more common in males because it is

    Explanation and discussion

  15. Question 15· Heredity and variation· JAMB

    The sex of a human child is determined by

    Explanation and discussion

  16. Question 16· Heredity and variation· JAMB

    Diagram for this question

    The bar chart shows the blood groups of 40 students. What percentage of the students have blood group O?

    Explanation and discussion

  17. Question 17· Heredity and variation· JAMB

    In DNA, the base adenine always pairs with

    Explanation and discussion

  18. Question 18· Heredity and variation· JAMB

    A test cross is a cross between an organism showing the dominant trait and one that is

    Explanation and discussion

  19. Question 19· Heredity and variation· JAMB

    Blood group AB is an example of

    Explanation and discussion

  20. Question 20· Heredity and variation· JAMB

    Two heterozygous tall plants (Tt) are crossed. The expected ratio of tall to dwarf offspring is

    Explanation and discussion

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