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How did Gregor Mendel use plant coloration in studies of heredity?
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coloration
The anole changes color in response to its stress level.
Gregor Mendel utilized plant coloration as a primary tool to uncover the fundamental laws of heredity. By focusing on easily distinguishable traits in garden peas, such as yellow versus green seed color and purple versus white flower color, he was able to track the inheritance of specific characteristics through successive generations.12
Mendel’s methodology involved crossing pure-breeding lines and performing exact quantitative counts of the resulting offspring. His experiments revealed several key genetic principles:2
- Dominance: When crossing pure-breeding plants (e.g., yellow seeds with green seeds), the first generation (F1) consistently displayed only one trait, which he termed dominant, while the other trait was recessive.12
- Segregation: By self-pollinating the F1 generation, he observed the reappearance of the recessive trait in the F2 generation in a consistent 3:1 ratio. This led him to deduce that hereditary units (now known as genes) exist in pairs and segregate during the formation of gametes.132
- Independent Assortment: By analyzing multiple traits simultaneously, such as seed color and shape, he discovered that different gene pairs segregate independently of one another.12