Jamb Biology Past Questions For Year 1991
Question 46
Which of the following characters is NOT sex-linked?
- A. River blindness
- B. Baldness
- C. Haemophilia
- D. Colour blindness
Question 47
When two heterozygotes mate, the dominant trait will appear in
- A. the F1 generation only
- B. the F2 generation only
- C. both the F1 and F2 generations
- D. neither the F1 nor F2 generation
Question 48
Sources of air pollutants are
- A. industrial chimneys, burning fossil oils and river dam
- B. sulphur dioxide, acid rain and pesticides
- C. sulphur mines, vehicle exhausts and aerosols
- D. sewage, smoke and old vehicle
Question 49
Which of the following diseases can be prevented by innoculation?
- A. Syphilis
- B. Malaria fever
- C. Tuberculosis
- D. Acquired Immune Deficiency Syndrom
Question 50
Which of these is NOT an adaptive features for arboreal life?
- A. Possession of long tail
- B. Possession of claws
- C. Possession of teeths
- D. counter shading in coat colour
