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JAMB and WAEC Biology questions: Heredity and variation

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

AllJAMBWAEC
All topicsCell structure and organisation · 56Cellular activities · 56Co-ordination and control · 58Ecology · 71Evolution · 45Excretion · 52Growth · 45Heredity and variation · 60Nutrition · 64Reproduction · 62Respiration · 55Support and movement · 50Transport · 57Variety of organisms · 60

  1. Question 21· Heredity and variation· JAMB

    The sex of a human child is determined by

    Explanation and discussion

  2. Question 22· 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

  3. Question 23· Heredity and variation· WAEC

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

    Explanation and discussion

  4. Question 24· Heredity and variation· WAEC

    Height in humans is an example of

    Explanation and discussion

  5. Question 25· Heredity and variation· WAEC

    The units of inheritance found on chromosomes are

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  6. Question 26· Heredity and variation· JAMB

    In DNA, the base adenine always pairs with

    Explanation and discussion

  7. Question 27· Heredity and variation· JAMB

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

    Explanation and discussion

  8. Question 28· Heredity and variation· WAEC

    The passing on of characteristics from parents to offspring is called

    Explanation and discussion

  9. Question 29· Heredity and variation· WAEC

    A man of blood group AB marries a woman of blood group O. What blood groups can their children have?

    Explanation and discussion

  10. Question 30· Heredity and variation· JAMB

    Blood group AB is an example of

    Explanation and discussion

  11. Question 31· Heredity and variation· JAMB

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

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  12. Question 32· Heredity and variation· JAMB

    A homozygous tall pea plant (TT) is crossed with a homozygous short one (tt). The F1 plants are

    Explanation and discussion

  13. Question 33· Heredity and variation· WAEC

    The physical appearance of an organism is its

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  14. Question 34· Heredity and variation· WAEC

    If a man of blood group AB marries a woman of group O, their children can have blood group

    Explanation and discussion

  15. Question 35· Heredity and variation· WAEC

    A child has sickle-cell anaemia (SS) when he receives

    Explanation and discussion

  16. Question 36· Heredity and variation· JAMB

    Two parents of genotype AS have a child. What is the probability that the child is SS?

    Explanation and discussion

  18. Question 38· Heredity and variation· WAEC

    Which of these is an example of discontinuous variation?

    Explanation and discussion

  19. Question 39· Heredity and variation· WAEC

    A characteristic that shows in the offspring whenever its gene is present is

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  20. Question 40· Heredity and variation· JAMB

    Two parents both have the genotype AS. What is the probability that their child will have the genotype SS?

    Explanation and discussion

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