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GCE Agricultural Science 1990 Question 30

Question 30

Basic Genetics

Study the diagram (a cross between homozygous tall pea and homozygous dwarf pea, rows labelled I, II and III). Which of the following is not true of the progenies labelled III? They are

Diagram for this question
  1. A.the first filial generation
  2. B.all tall pea plants
  3. C.produced by a monohybrid cross
  4. D.of the same genotype
  5. E.different phenotypes.
Show the answer and explanation

Answer: E (different phenotypes.)

Explanation

All F1 offspring are Tt, so they all look tall; they do not have different phenotypes.