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Biology 2012 WAEC Past Questions

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56
In a case of complete dominance, what is the phenotypic ratio of the cross Bb X Bb; where B =black and b = white?
  • A. 1 black : 1 grey : 2 whites
  • B. 1 black : 3 whites
  • C. 1 black : 2 blues : 1 white
  • D. 3 blacks : 1 white
View Answer & Discuss (2) WAEC 2012
57

Two yellow-flowered hybrid plants each carrying a recessive factor for flowers with green colour were crossed.
Which of the following ratios shows the correct proportion of offspring that have green flowers?

  • A. 2 in 2
  • B. 1 in 3
  • C. 1 in 4
  • D. 1 in 5
View Answer & Discuss (3) WAEC 2012
58
What name is given to a sudden change in a gene or chromosome?
  • A. Allele
  • B. Genotype
  • C. Mutation
  • D. Phenotype
View Answer & Discuss (2) WAEC 2012
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59
Bees are of great importance to the farmer because they
  • A. provide him with honey
  • B. pollinate flowers
  • C. sting crop pests to death
  • D. destroy flowers by sucking nectar from them
View Answer & Discuss (5) WAEC 2012
60
Which of the following sequences is the correct evolutionary trend in plants?
  • A. Algae → liverworts → mosses → ferns
  • B. Liverworts → mosses → ferns → algae
  • C. mosses → algae → ferns → liverworts
  • D. Ferns → Liverworts → mosses → algae
View Answer & Discuss WAEC 2012
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