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Biology WAEC Past Questions

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1976

Which of the following nucleotides is not found in the DNA molecules?

  • A. Adenine
  • B. Cytosine
  • C. Guanine
  • D. Uracil
View Answer & Discuss (1) WAEC 2019
1977

In a complete dominance monohybrid cross between a pure breeding yellow-flowered plant Y and a pure breeding white-flowered plant y, the result of the first filial generation is _________

  • A. 50 % yellow flowers
  • B. 75% yellow flowers
  • C. all yellow flowers
  • D. all white flowers
View Answer & Discuss WAEC 2019
1978

A man whose blood group is heterozygous B is married to a woman whose blood up is also heterozygous B

Which of the following statements is correct about the blood group of their four offspring?

  • A. Three of them belong to blood group B
  • B. Three of them belong to blood group O
  • C. None of them belongs to blood group O
  • D. Two of them belong to blood group B
View Answer & Discuss (15) WAEC 2019
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1979

The cross between RrTt and rrtt where R is a gene for red colour and T for tallness will result in______

  • A. all the offspring being tall with red fruits
  • B. 25 % tall with red fruits
  • C. 50 % tall with red fruits
  • D. 75 % tall with red fruits
View Answer & Discuss (12) WAEC 2019
1980

The yellow and black stripes on the body of wasps is an example of________

  • A. mimicry
  • B. courtship behaviour
  • C. camouflage
  • D. warning colouration
View Answer & Discuss (1) WAEC 2019
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