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JAMB UTME Biology 2026 past questions and answers

This 2026 JAMB UTME Biology set has 40 practice questions. Try these 5 free sample questions, tap a question to reveal the answer and explanation. Then practise the whole 2026 set with instant marking.

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Sample JAMB UTME Biology 2026 questions

1. Which characteristic in humans is most likely to show continuous variation?
  1. Body height
  2. Ability to roll the tongue
  3. Blood group
  4. Attached or free earlobes

Answer: A. Body height

Body height varies across a range and is influenced by several genes and environmental factors, so it shows continuous variation.

2. In a cross between two heterozygous tall plants (Tt x Tt), what genotypic ratio is expected among the offspring?
  1. 3 TT : 1 tt
  2. 1 TT : 2 Tt : 1 tt
  3. 1 Tt : 1 tt
  4. 3 Tt : 1 TT

Answer: B. 1 TT : 2 Tt : 1 tt

Each parent produces T and t gametes, giving TT, Tt, Tt and tt in a 1:2:1 genotypic ratio.

3. Colour blindness is caused by a recessive allele on the X chromosome. A carrier woman has children with a man who is not colour-blind; what is the probability that a son will be colour-blind?
  1. One quarter
  2. All sons
  3. One half
  4. No sons

Answer: C. One half

A son receives his X chromosome from his mother, who passes the colour-blind allele to half her sons on average.

4. After repeated insecticide use, a population of insects becomes harder to kill. Which process best explains this change?
  1. Individual insects deliberately adapt during their lifetime
  2. The insecticide causes every insect to become resistant
  3. The insects stop reproducing
  4. Resistant insects survive and leave more offspring than susceptible insects

Answer: D. Resistant insects survive and leave more offspring than susceptible insects

Pre-existing resistant insects are more likely to survive treatment and reproduce, increasing the resistance allele in the population.

5. The forelimbs of a bat and a human have similar basic bone arrangements but perform different functions. This similarity is evidence of
  1. common ancestry
  2. identical habitats
  3. artificial selection
  4. convergent evolution only

Answer: A. common ancestry

Their homologous bone patterns indicate inheritance from a common ancestor despite their different functions.

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