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Cambridge IGCSE Biology practice

Paper 3 structured question: Monohybrid inheritance

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3

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2

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Topic

Monohybrid inheritance

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Paper 3Theory (Core)2 marks

Genetics and inheritance

Description

Expression of Recessive Alleles

A recessive allele is expressed in the phenotype only when no dominant allele is present in the genotype.

  1. a

    State when a recessive allele is expressed in the phenotype.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 3 structured question: Monohybrid inheritance

Paper 3Theory (Core)1 marks

Description

Recessive Alleles

A recessive allele is one that is expressed in the phenotype only when no dominant allele is present in the genotype.

  1. a

    Describe what is meant by a recessive allele?

    Aim for approximately 1 distinct marking point.

    [1]