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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)3 marks

Sex-linked traits are linked to genes on sex chromosomes, affecting their prevalence in males and females.

Diagram Description

Sex chromosomes in males and females

Diagram shows that females have two X chromosomes (XX) and males have one X and one Y chromosome (XY).

  1. a

    Identify which sex chromosome carries most genes responsible for sex-linked traits.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Describe how the difference in sex chromosomes between males and females affects the prevalence of sex-linked traits.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 4 structured question: Monohybrid inheritance

Paper 4Theory (Extended)3 marks

Description

Sex-linked traits

A sex-linked trait is one where the gene responsible is located on a sex chromosome. Because males and females have different sex chromosomes, these traits often appear more frequently in one sex.

  1. a

    State what is meant by a sex-linked trait?

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Describe why sex-linked traits are often more common in males than females.

    Aim for approximately 2 distinct marking points.

    [2]