Textbook
Chapter 1: Plant Tissue Organisation and Growth
Chapter 2: Structure and Leaf Function
Chapter 3: Nutrition in Plants
Chapter 4: Transportation in Plants
Chapter 5: Response in Plants
Chapter 6: Sexual Reproduction in Flowering Plants
Chapter 7: Adaptation of Plants to Different Habitats
Chapter 8: Biodiversity
Chapter 9: Ecosystem
Chapter 10: Environmental Sustainability
Chapter 11: Inheritance
Chapter 12: Variation
Chapter 13: Genetic Technology
Chapter 12: Variation
What you need to learn in this chapter
In this chapter on Variation, we will be learning about different types and factors of variation. We will understand what variation means and why it is important for the survival of species. We will also explore variation in humans and how it is related to inheritance. Through experiments, we will study continuous and discontinuous variations in humans. Additionally, we will learn about mutations and their meanings, such as mutagens, mutations, and mutants. We will also identify different types of mutagens, including physical, chemical, and biological agents.
Topics in this chapter
1. Types and Factors of Variation
What you will learn in this topic
- Explain the meaning of variation
- Justify the necessity of variation for species survival
- Describe the types of variation: (i) continuous variation. (ii) discontinuous variation
- Compare and contrast continuous variation with discontinuous variation
- Correlate the cause of variation with the type of variation: (i) genetic factors. - crossing over - independent arrangement of chromosomes - random fertilization - mutation. (ii) environmental factors. - temperature - light - pH
- Describe the variation that results from the interaction between genetic factors and environmental factors
2. Variation in Humans
What you will learn in this topic
- Correlate the types of variation to human inheritance
- Experiments to study continuous variation and discontinuous variation in humans within humans
3. Mutation
What you will learn in this topic
- Explain the meaning of: (i) mutagen. (ii) mutation. (iii) mutants
- Describe the types of mutagens: (i) physical agents. (ii) chemical agents. (iii) biological agents
- Describe the types of mutations with examples: (i) gene mutation. (ii) chromosomal mutation
- Correlate the somatic cell and gamete cell mutations with variation
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