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OJEE Dihybrid Cross — practice questions

Explore 2 free Dihybrid Cross questions in OJEE Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Dihybrid Cross questions and exercises with answers

Showing questions 1–2 of 2.

The F₂ **phenotypic** ratio of a Mendelian dihybrid cross is:Read the answer and worked solution →In a dihybrid cross TtRr × TtRr in pea, the **probability** of producing a homozygous recessive (ttrr) offspring is:Read the answer and worked solution →

Worked practice questions

The F₂ **phenotypic** ratio of a Mendelian dihybrid cross is:

  1. 3 : 1
  2. 1 : 2 : 1
  3. 9 : 3 : 3 : 1
  4. 1 : 1 : 1 : 1
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Correct answer: C. 9 : 3 : 3 : 1

Dihybrid TtRr × TtRr → 16 combinations. Phenotype ratio = 9 (T_R_) : 3 (T_rr) : 3 (ttR_) : 1 (ttrr) — the classic 9:3:3:1 dihybrid ratio, illustrating the law of independent assortment.

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In a dihybrid cross TtRr × TtRr in pea, the **probability** of producing a homozygous recessive (ttrr) offspring is:

  1. 1/4
  2. 1/8
  3. 1/16
  4. 9/16
Show answer and solution

Correct answer: C. 1/16

Tt × Tt yields tt with probability 1/4. Independently, Rr × Rr yields rr with probability 1/4. By independent assortment, P(ttrr) = (1/4)(1/4) = 1/16 — which matches the single '1' in the 9:3:3:1 ratio.

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