Theme D: Continuity and Change
The chapter explores essential biological processes including DNA replication, protein synthesis, and cell division, highlighting key molecular mechanisms and their implications for genetics and inheritance. It further discusses gene expression, water potential in cells, reproduction, and the principles of natural selection and ecosystem dynamics. The interactions between species and their environment, along with the challenges posed by climate change, are presented as vital concepts in understanding biological continuity and change.
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Sections
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What we have learnt
- DNA replication is a semi-conservative process crucial for cell division and ensuring genetic continuity.
- Protein synthesis involves transcription and translation processes, critically affecting cellular functions.
- Mutations and gene editing technologies like CRISPR-Cas9 have significant implications for genetics and biotechnology.
- Cell division encompasses mitosis and meiosis, each serving critical functions in growth and reproduction.
- Homeostasis and feedback mechanisms are essential for maintaining stability in living organisms.
Key Concepts
- -- SemiConservative Replication
- The process whereby each new DNA molecule contains one original strand and one newly synthesized strand.
- -- Transcription
- The process of synthesizing RNA from a DNA template, critical for protein production.
- -- Gene Editing
- Technologies that allow for precise modifications in the DNA sequence, such as CRISPR-Cas9.
- -- Natural Selection
- The process through which advantageous traits increase in frequency within a population.
- -- Ecological Succession
- The gradual process of species replacement in a given habitat over time.
Additional Learning Materials
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