9700 · 16.2
The roles of genes in determining the phenotype
Welcome to a crucial topic that bridges genetics and observable characteristics! In this lesson, we'll dive deep into how your **genotype** (your genetic makeup) translates into your **phenotype** (your observable traits), and critically, how this isn't a straightforward, fixed process. Prepare to understand the dynamic interplay between your genes and the world around you, including the fascinating field of **epigenetics**. Key points align with **A-Level Notes** 9700 Biology chapter **16** (topic **16.2**).
Need to know
What you need to know
- Genes provide instructions for making proteins, which are the fundamental building blocks and functional molecules of an organism.
- The type and activity of proteins determine an organism's observable traits or phenotype.
- Many traits, such as height, weight, and skin colour, are influenced by a complex interplay between genes and environmental factors.
- Environmental factors can modify gene expression or the direct manifestation of a trait, leading to phenotypic plasticity.
Explanation
The roles of genes in determining the phenotype
- Genes provide instructions for making proteins, which are the fundamental building blocks and functional molecules of an organism.
- The type and activity of proteins determine an organism's observable traits or phenotype.
- Many traits, such as height, weight, and skin colour, are influenced by a complex interplay between genes and environmental factors.
- Environmental factors can modify gene expression or the direct manifestation of a trait, leading to phenotypic plasticity.