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WAEC Biology 2004 Question 55

Question 55

Mendelian Inheritance

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

  1. A.100% tall 0% dwarf
  2. B.75% tall 25% dwarf
  3. C.50% tall 50% dwarf
  4. D.25% tall 75% dwarf
Show the answer and explanation

Answer: C (50% tall 50% dwarf)

Explanation

Tt × tt gives Tt and tt in equal numbers, so half the offspring are tall and half dwarf.