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Biology 1987 JAMB Past Questions

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36
Unlike auxins, gibberellins
  • A. induces the formation of adventitious roots
  • B. do not affect leaf and fruit abscission
  • C. cannot stimulate stem elongation
  • D. are quite effective as herbicides
View Answer & Discuss (3) JAMB 1987
37
A gene which expresses itself only in the homozygous condition is
  • A. a mutant
  • B. dominant
  • C. recessive
  • D. lethal
View Answer & Discuss (6) JAMB 1987
38
An example of monohybride inheritance in man is
  • A. astigmatism
  • B. cretinism
  • C. hyperthyroidism
  • D. albinism
View Answer & Discuss (9) JAMB 1987
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39
If a plant homozygous for round and yellow (RR : YY), is crossed with a wrinkle green type (rr : yy) all of the resulting seeds will be
  • A. blue and wrinkled
  • B. round and yellow
  • C. wrinkled and yellow
  • D. round and greenish yellow
View Answer & Discuss (9) JAMB 1987
40
The ratio of carriers to sicklers in the F1 generation derived from a parental cross of two carriers of haemoglobin S gene is
  • A. 3 : 1
  • B. 1 : 3
  • C. 2 : 1
  • D. 1 : 2
View Answer & Discuss (21) JAMB 1987
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