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Cambridge IGCSE Biology practice

Paper 4 structured question: Monohybrid inheritance

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Monohybrid inheritance

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Paper 4Theory (Extended)2 marks

Red-green colour blindness is a genetic condition affecting the ability to distinguish between red and green colours. It is caused by a gene located on the X chromosome.

Description

Red-Green Colour Blindness

Red-green colour blindness is more common in males than females because it is a sex-linked trait caused by a gene on the X chromosome.

  1. a

    Describe why red-green colour blindness is more common in males than females.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 4 structured question: Monohybrid inheritance

Paper 4Theory (Extended)2 marks

Description

Inheritance of Red-Green Colour Blindness

A mother is a carrier of red-green colour blindness, and the father has normal vision.

  1. a

    Describe the chance that their son will have red-green colour blindness.

    Aim for approximately 2 distinct marking points.

    [2]