SHS3 General Science · Semester 2 Week 15: The Human Body and Health

Lesson notes

Learning Objectives

Indicator: B3.4.1.LI.1

By the end of the lesson, learners can:

Draw a Punnett square crossing to show how sex is determined in humans, using X and Y chromosomes.
Explain, with a labelled diagram, why there is roughly a 1:1 ratio of male to female offspring in human populations.
Analyse a given pedigree or family scenario to predict the probability of a child being male or female.
Critique their own and peers’ chromosome diagrams against standard charts, identifying at least one error or improvement.
Apply the concept of Mendelian crossing to explain why fathers determine the sex of a baby, not mothers.

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Curriculum details

Strand: Relationships with the Environment (Strand 4)
Sub-strand: The Human Body and Health (4.1)
Content standard: 3.4.1.CS.2 - Explore and model sex determination in humans 3.4.1.LO.2 Design mind maps and concept maps of some Mendelian crossing to sex determination in humans.
Indicator: 3.4.1.LI.1 - Draw Mendelian crossings to explain sex determination in humans.
Suggested placement: Semester 2, Week 15 (Week 35 of the year)
Our suggestion, laid out in curriculum order across three terms of twelve weeks. NaCCA does not fix the week, so follow your school's scheme of learning.
Curriculum reference: NaCCA curriculum document, p. 113

Exemplars (from the NaCCA curriculum)

Diamond 9 approach:
- Using the Diamond 9 Approach, allow learners to discuss their understanding of Mendelian crossing to show sex determination.
- Get learners to compare individual drawings with drawings on pictures, videos or charts and critique themselves.
- Using videos and pictures, put learners into groups to discuss and draw some Mendelian crossings and explain how this show exemplifies sex determination.
Teaching and Learning Resources:
- Wall charts
- Books
- Pictures and videos on Mendelian crossing.
Assessment (3.4.1.AS.1). The document marks these depth-of-knowledge levels for this indicator: Level 3 Strategic reasoning.