Inheritance & EvolutionDiagram

Visual: Sex Determination

Part of Sex Determination — GCSE Biology

This diagram covers Visual: Sex Determination within Sex Determination for GCSE Biology. Sex chromosomes and sex determination mechanisms It is section 3 of 11 in this topic. Focus on the labels, the relationships between parts, and the explanation that turns the diagram into an exam-ready answer.

Topic position

Section 3 of 11

Practice

26 questions

Recall

20 flashcards

Visual: Sex Determination

Sex determination diagram showing XX (female) and XY (male) chromosomes, how gametes are produced (eggs all X, sperm X or Y), Punnett square showing 50:50 probability, and explaining that the father's sperm determines the sex

Remember: XX = female, XY = male | Father determines sex (passes X or Y) | 50% chance of each sex

Keep building this topic

Read this section alongside the surrounding pages in Sex Determination. That gives you the full topic sequence instead of a single isolated revision point.

Inheritance of Sex How It Works: XX and XY Determine Sex Sex Chromosomes Key Definitions

Practice Questions for Sex Determination

What determines the sex of a human baby?

A. The sex chromosomes inherited from the parents
B. The number of genes the baby has
C. Environmental factors during pregnancy
D. The age of the mother

1 markfoundation

Use a genetic diagram to show how sex is inherited in humans.

3 marksstandard

Quick Recall Flashcards

How do you remember XX = female and XY = male?

XX: the two X's look like chromosomes that pair up perfectly — females have a matching pair. XY: the Y looks like a little man standing with arms out — males have the odd one out. 'Why are boys different? Because of Y!'

What sex chromosomes do females and males have?

Females: XX (two X chromosomes). Males: XY (one X and one Y chromosome). These are the 23rd pair of chromosomes in humans.

26 questions on Sex Determination — practise free

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Inheritance of Sex

How It Works: XX and XY Determine Sex