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Biology 1992 JAMB Past Questions

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41
A child with blood group genotype different from those of both parents and with a mother of genotype OO, can only have a father of genotype
  • A. A
  • B. B
  • C. AB
  • D. OO
View Answer & Discuss (6) JAMB 1992
42
If R and r, denotes the genes for a character, the offspring of the cross between RR and Rr are
  • A. RR, 2Rr, rr
  • B. 2RR, 2rr, 2rr
  • C. 2RR, 2Rr
  • D. 4Rr
View Answer & Discuss (2) JAMB 1992
43
A mammal with red fur and long ears was crossed with another having white fur and short ears. If the offspring had a red fur and short ears, the
  • A. character are linked
  • B. character are not linked
  • C. parents are related
  • D. parents are not related
View Answer & Discuss (16) JAMB 1992
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44
Pawpaw seeds collected from a tree with many desirable agronomic qualities did not give rise to plants of desirable character as the parent because
  • A. seeds are not reliable for propagating plants
  • B. uncontrolled out-crossing can introduced unwanted variability
  • C. vegetative propagation is best form of reproduction of all crop
  • D. seeds were not physiologically mature at the harvest
View Answer & Discuss (1) JAMB 1992
45
Woman do not suffer from colour blindness because
  • A. the trait is sex-linked
  • B. only men are colour blind
  • C. the genes are recessive and sex-linked
  • D. the genes occur on both the X and Y chromosomes
View Answer & Discuss (2) JAMB 1992
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