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Cambridge IGCSE Biology practice

What happens to the recessive allele when a dominant allele is present?

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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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What happens to the recessive allele when a dominant allele is present?.

  1. A.It is expressed in the phenotype
  2. B.It is masked and not expressed
  3. C.It becomes dominant
  4. D.It changes the dominant allele

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Paper 3 structured question: Monohybrid inheritance

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Description

Dominant Alleles

A dominant allele is one that is expressed in the phenotype if present in the genotype.

  1. a

    State what is meant by a dominant allele?

    Aim for approximately 1 distinct marking point.

    [1]