LIFE
SCIENCES
Grade 12 Textbook
, Contributors
Dr Arnold Johannes, Mr Peter Weisswange (editors), Ms Angie
Weisswange (illustrator), Ms Tiffany Bell, Ms Margaret Elferink, Mr
Jason Field, Ms Michelle Tracy Hagemann, Ms Kathryn Lamarque,
Ms Jessica Marais, Ms Alydia Monteith, Ms Danielle Stander, Mr
Peter Weisswange (all authors), Ms Helena Oosthuizen, Ms Delia
Stander, Ms Kerstin Stoltsz.
.
Quality Assurance
by Life Sciences Subject Advisors,
under the direction of Mr Kanthan Naidoo (CES):
Ms Phumzile Dlamini (EC), Mr Gonasagaren Pillay (KZN), Ms
Zimasa Sanda (EC), Ms Jennifer Titus (NC)
Produced for the National Department of Basic Education
© DBE
,TABLE OF CONTENTS
Introducing Life Sciences 1
Strand: Life at molecular, cellular and tissue level
1. DNA: The Code of Life 6
2. Meiosis 33
Strand: Life processes in plants and animals
3. Reproductive Strategies in Vertebrates 61
4. Human Reproduction 70
Strand: Diversity, change and continuity
5. Genetics and Inheritance 102
Strand: Life processes in plants and animals
6. Human Responses to the Environment 151
7. The Human Endocrine System and Homeostasis 198
8. Plant Responses to the Environment 236
Strand: Diversity, change and continuity
9. Evolution by Natural Selection 258
10. Human Evolution 289
Appendices
A Final Word: Assessments 332
Answers to Activities 335
Image Attribution 366
,
SCIENCES
Grade 12 Textbook
, Contributors
Dr Arnold Johannes, Mr Peter Weisswange (editors), Ms Angie
Weisswange (illustrator), Ms Tiffany Bell, Ms Margaret Elferink, Mr
Jason Field, Ms Michelle Tracy Hagemann, Ms Kathryn Lamarque,
Ms Jessica Marais, Ms Alydia Monteith, Ms Danielle Stander, Mr
Peter Weisswange (all authors), Ms Helena Oosthuizen, Ms Delia
Stander, Ms Kerstin Stoltsz.
.
Quality Assurance
by Life Sciences Subject Advisors,
under the direction of Mr Kanthan Naidoo (CES):
Ms Phumzile Dlamini (EC), Mr Gonasagaren Pillay (KZN), Ms
Zimasa Sanda (EC), Ms Jennifer Titus (NC)
Produced for the National Department of Basic Education
© DBE
,TABLE OF CONTENTS
Introducing Life Sciences 1
Strand: Life at molecular, cellular and tissue level
1. DNA: The Code of Life 6
2. Meiosis 33
Strand: Life processes in plants and animals
3. Reproductive Strategies in Vertebrates 61
4. Human Reproduction 70
Strand: Diversity, change and continuity
5. Genetics and Inheritance 102
Strand: Life processes in plants and animals
6. Human Responses to the Environment 151
7. The Human Endocrine System and Homeostasis 198
8. Plant Responses to the Environment 236
Strand: Diversity, change and continuity
9. Evolution by Natural Selection 258
10. Human Evolution 289
Appendices
A Final Word: Assessments 332
Answers to Activities 335
Image Attribution 366
,
