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Cambridge IGCSE Biology practice

Paper 3 structured question: Chromosomes, genes and proteins

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Chromosomes, genes and proteins

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Paper 3Theory (Core)2 marks

Inheritance of sex in humans

Diagram Description

Sex Chromosome Inheritance

Diagram shows a mother with XX chromosomes and a father with XY chromosomes producing offspring.

ParentSex Chromosomes
MotherXX
FatherXY
  1. a

    Describe how the sex of a child is determined in humans.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 3 structured question: Chromosomes, genes and proteins

Paper 3Theory (Core)1 marks

Description

Sex Chromosome Combinations

A child inherits one sex chromosome from each parent. Females have XX chromosomes, males have XY chromosomes.

  1. a

    Identify the sex chromosome combination for a male child.

    Aim for approximately 1 distinct marking point.

    [1]