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Thursday, 01 October 2026
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Biology Past Questions and Answers

Topic: Inheritance of characters in organisms

Jamb Biology Questions - Inheritance of characters in organisms

Question 1:
In a breeding program a cross was made between two true breeding cow-pea types: one with round seeds and the other with wrinkled seed. If roundness is dominant why wrinkleness is recessive, in the first filial generation all the seeds produced will be
  • A 50% wrinkled, 50% round
  • B 75% wrinkled, 25% round
  • C 100% round
  • D 100% wrinkled
  • E 25% wrinkled, 75% round
View Answer & Explanation
Question 2:
In a breeding program a cross was made between two true breeding cow-pea types: one with round seeds and the other with wrinkled seed. If roundness is dominant why wrinkleness is recessive, in the first filial generation all the seeds produced will be
  • A 25% wrinkled, 75% round
  • B 100% wrinkled
  • C 50% wrinkled, 50% round
  • D 75% wrinkled, 25% round
  • E 100% round
View Answer & Explanation
Question 3:
An example of monohybride inheritance in man is
  • A Astigmatism
  • B Cretinism
  • C Hyperthyroidism
  • D Albinism
View Answer & Explanation
Question 4:
when the two alleles present in an organism are of the same type, the genotype is described as
  • A Heterozygous
  • B Heterogamous
  • C Homozygous
  • D Homologous
View Answer & Explanation
Question 5:
Which of the following is a sex-linked character?
  • A Sickle-cell anaemia
  • B Tongue rollling
  • C Skin colour
  • D Colour blindness
View Answer & Explanation