English National Curriculum - Science

Sex determination

Mission Objectives

Explain the role of chromosomes in determining the biological sex of a human

Use a genetic diagram to predict and explain the outcome of sex determination

Calculate and explain the probability of producing a male or female offspring

Sign up to access this content
Rocket Words Quiz

Rocket Words Quiz

See if you know all the meanings of the rocket words

Assessment Quiz

Assessment Quiz

Test your knowledge of this lesson

Word Search Game

Word Search Game

Find all the rocket words in the grid

Lesson Resources

Lesson Plan

View and print the lesson plan

View

Downloads

Save files related to this lesson

Keywords

Words and meanings to learn

chromosome

a structure found in the nucleus of a cell that contains genetic material (DNA)

sex chromosome

a chromosome that determines the biological sex of an organism (in humans, X and Y)

gamete

a sex cell (sperm or egg) that contains half the number of chromosomes of a body cell

fertilisation

the fusion of male and female gametes to form a zygote with the full number of chromosomes

Punnett square

a diagram used to predict the possible genetic outcomes of a cross between two parents

Required Resources

Handouts

Warning: You are now leaving Developing Experts.

These links are being provided as a convenience and for informational purposes only; they do not constitute an endorsement or an approval from Developing Experts of any of the products, services or opinions of the corporation or organisation or individual.

Developing Experts bears no responsibility for the accuracy, legality or content of the external site or for that of subsequent links. Contact the external site for answers to questions regarding its content.

You will be redirected to:

Expert film

Sign up to access this content

This lesson is only available to users with an active subscription.

Mission assignment film

Sign up to access this content

This lesson is only available to users with an active subscription.

Stay connected

Join our newsletter to stay up to date on features and releases

Address
Developing Experts Limited
Exchange Street Buildings
35-37 Exchange Street
Norwich
NR2 1DP
UK

Phone
01603 273515

Email
[email protected]

Developing Experts

LessonsAboutResearchReportingPlans & Pricing

Legal

GDPRPrivacy PolicyTerms and ConditionsCookie Policy

Contact Us

Get in touchRequest SubscriptionChildren's CodeAbout UsCareers

Copyright 2026 Developing Experts, All rights reserved.