Edexcel International AS and A level Biology XBI11/YBI11 · 4.20
Allele frequency and speciation
- Code
- 4.20
- In
- 4 Plant Structure and Function, Biodiversity and Conservation
- Topic
- U2 Cells, Development, Biodiversity and Conservation
- Course
- International AS and A level Biology XBI11/YBI11
- Board
- Edexcel
Grade boundaries·Edexcel command words
Codes and titles are read by a script from Edexcel's published specification and have not been checked by a person. What each point covers is in the specification itself: Edexcel’s specification.
Points under 4.20
Points in 4 Plant Structure and Function, Biodiversity and Conservation
- 4.1 Plant cells
- 4.2 Recognising plant organelles in electron micrographs
- 4.3 Starch and cellulose
- 4.4 Cellulose microfibrils and plant fibre properties
- 4.5 Sclerenchyma fibres, xylem vessels and phloem
- 4.6 Core practical 7: plant tissues under the light microscope
- 4.7 Plant fibres, starch and sustainability
- 4.8 Water and inorganic ions in plants
- 4.9 Core practical 8: tensile strength of plant fibres
- 4.10 Conditions for bacterial growth
- 4.11 Antimicrobial and therapeutic substances from plants
- 4.12 Core practical 9: antimicrobial properties of plants
- 4.13 Development of drug testing
- 4.14 Classification
- 4.15 Variety of life and threats from human activity
- 4.16 Biodiversity and endemism
- 4.17 Species richness and heterozygosity index
- 4.18 Index of diversity
- 4.19 Niches and adaptations
- 4.20 Allele frequency and speciation
- 4.21 Zoos, seed banks and conservation