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Cambridge IGCSE Biology practice

If a Punnett square shows four different genotypes, what does this mean?

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MCQ

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cambridge_mcq

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Topic

Monohybrid inheritance

Exam-style question

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If a Punnett square shows four different genotypes, what does this mean?.

  1. A.Only one genotype is possible
  2. B.There is genetic variation among offspring
  3. C.All offspring have the same genotype
  4. D.The parents are identical

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Paper 3 structured question: Monohybrid inheritance

Paper 3Theory (Core)2 marks

Description

Genetic Cross of Pea Plants

Cross between two heterozygous tall pea plants (Tt x Tt).

Parent 1 allelesParent 2 alleles
Tt
Tt
  1. a

    Identify the genotypes that can result from this cross.

    Aim for approximately 2 distinct marking points.

    [2]