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Biology 2004 WAEC Past Questions

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51
The ability of some individuals to taste phenylthiocarbamide (PTC) is a
  • A. morphological adaptation
  • B. morphological variation
  • C. physiological adaptation
  • D. physiological variation
View Answer & Discuss WAEC 2004
52
In man, sex is determined by the inheritance of
  • A. a pair of homologous chromosomes
  • B. an extra chromosome in the cells of a female
  • C. a dominant gene for maleness present in man
  • D. two similar X chromosomes in the female and X and Y chromosomes in the male.
View Answer & Discuss (4) WAEC 2004
53
What will be the genotypic ratio when two heterozygous red pea plants are crossed?
  • A. 1 : 0
  • B. 1 : 2 : 1
  • C. 2 : 1
  • D. 3 : 1
View Answer & Discuss (1) WAEC 2004
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54
Which of the following traits in humans can be affected by environmental factors?
  • A. skin colour
  • B. eye colour
  • C. baldness
  • D. tongue-rolling
View Answer & Discuss (3) WAEC 2004
55

Heterozygous tall plants were crossed with pure-breeding dwarf plants of the same species. What were the approximate percentages of the offspring?

  • A. 100% tall 0% dwarf
  • B. 75% tall 25% dwarf
  • C. 50% tall 50% dwarf
  • D. 25% tall 75% dwarf
View Answer & Discuss (14) WAEC 2004
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