Biology – Variation | e-Consult
Variation (1 questions)
Here's a table summarizing the key differences between discontinuous and continuous variation:
| Feature | Discontinuous Variation | Continuous Variation |
| Number of Phenotypes | Limited, distinct categories | Wide range of phenotypes |
| Genetic Basis | Single gene with a few alleles (often Mendelian) | Multiple genes (polygenic inheritance) and environmental factors |
| Graphical Representation | Bar chart or pie chart showing proportions of categories | Histogram showing a bell-shaped distribution (normal distribution) |
| Example | Blood group (A, B, AB, O) | Height, weight, skin colour |
Discontinuous Variation: As explained previously, this variation is characterized by a limited number of distinct phenotypes. It's typically controlled by a single gene with a few alleles, leading to clear-cut categories. The variation is often represented graphically using bar charts or pie charts to show the proportion of individuals within each category. Blood group is a classic example.
Continuous Variation: This variation exhibits a range of phenotypes, with individuals falling anywhere along a spectrum. It's influenced by multiple genes and environmental factors. The variation is typically represented graphically using a histogram, which shows a bell-shaped distribution (normal distribution). Height is a good example, where individuals vary in height, and the distribution of heights within a population follows a normal curve.