IGCSE Biology 27 Views 1 Answers

Sourav PanNovember 15, 2024
State that continuous variation results in a range of phenotypes between two extremes; examples include body length and body mass
State that continuous variation results in a range of phenotypes between two extremes; examples include body length and body mass
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Sourav PanMay 15, 2025
Continuous Variation and Phenotypic Range
Continuous variation refers to the gradual changes in phenotypes that occur within a population, resulting in a spectrum of traits rather than distinct categories. This type of variation allows for a range of phenotypes that lie between two extremes.
Characteristics of Continuous Variation
- Range of Phenotypes: Continuous variation produces traits that can be measured along a continuum. For example, individuals may exhibit varying degrees of a particular characteristic, such as height or weight.
- Influence of Multiple Genes: Traits that show continuous variation are often polygenic, meaning they are influenced by multiple genes. This results in a wide range of possible phenotypes.
Examples of Continuous Variation
- Body Length
- Individuals within a species may exhibit a range of body lengths, from very short to very long. For instance, in many mammal species, body length can vary significantly among individuals due to genetic and environmental factors.
- Body Mass
- Similar to body length, body mass also shows continuous variation. For example, within a species like humans or dogs, individuals can weigh anywhere from very light to very heavy, reflecting differences in genetics, diet, and lifestyle.
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