Mitosis and DNA in Biology

Understanding Cell Division and Genetic Material Grade 11 Biology LEAP 2025 Aligned

What is DNA?

Deoxyribonucleic acid - the blueprint of life Contains genetic instructions for all living organisms Made up of nucleotides with four bases: A, T, G, C Forms the famous double helix structure

DNA Structure and Function

{"left":"Double helix shape discovered by Watson and Crick\nSugar-phosphate backbone provides stability\nComplementary base pairing: A-T and G-C","right":"Stores genetic information in sequence of bases\nLocated in the nucleus of eukaryotic cells\nGuides protein synthesis and cell functions"}

Think About It

Why do you think cells need to divide? What happens to DNA during cell division?

Introduction to Mitosis

Process of cell division in eukaryotic cells Produces two genetically identical daughter cells Essential for growth, development, and repair Ensures equal distribution of genetic material

The Phases of Mitosis

Mitosis Modeling Activity

Work in groups of 4 students Use colored yarn to represent chromosomes Model each phase of mitosis step by step Discuss what happens to DNA in each phase

Key Takeaway

"Mitosis ensures that every cell in your body contains the exact same genetic information as the original fertilized egg."