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PUCET (Punjab) Monohybrid Cross — practice questions

Explore 2 free Monohybrid Cross questions in PUCET (Punjab) Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Monohybrid Cross questions and exercises with answers

Showing questions 1–2 of 2.

The F₂ **phenotypic** ratio of a Mendelian monohybrid cross is:Read the answer and worked solution →The F₂ **genotypic** ratio of a Mendelian monohybrid cross is:Read the answer and worked solution →

Worked practice questions

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

  1. 1 : 1
  2. 3 : 1
  3. 1 : 2 : 1
  4. 9 : 3 : 3 : 1
Show answer and solution

Correct answer: B. 3 : 1

Tt × Tt → 1 TT : 2 Tt : 1 tt (genotypic). Since T is dominant, phenotypes are 3 Tall : 1 Dwarf — the classic 3:1 monohybrid ratio.

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The F₂ **genotypic** ratio of a Mendelian monohybrid cross is:

  1. 3 : 1
  2. 1 : 1
  3. 1 : 2 : 1
  4. 9 : 3 : 3 : 1
Show answer and solution

Correct answer: C. 1 : 2 : 1

Tt × Tt → 1 TT : 2 Tt : 1 tt — three genotypes in a 1:2:1 ratio. The phenotypic ratio (3:1) arises by lumping TT and Tt as dominant phenotype.

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