Multiple Choice
In what way is a gene pool representative of a population?
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22. Evolution of Populations
Genetic Variation
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Which of the following statements is true of continuous phenotypic variation?
A
It is typically influenced by multiple genes and environmental factors.
B
It leads to discrete categories of phenotypes.
C
It results from a single gene with two alleles.
D
It is not affected by environmental factors.
Verified step by step guidance1
Understand the concept of continuous phenotypic variation: Continuous variation refers to a range of small differences in a shared trait. Traits that show continuous variation are typically influenced by multiple genes, known as polygenic inheritance, and can also be affected by environmental factors.
Identify the characteristics of continuous variation: Unlike discrete variation, which results in distinct categories (e.g., blood type), continuous variation results in a spectrum of phenotypes, such as height or skin color.
Consider the role of multiple genes: Continuous variation is often the result of the combined effect of many genes (polygenic traits), each contributing a small amount to the overall phenotype.
Evaluate the influence of environmental factors: Environmental factors can also play a significant role in continuous variation, affecting the expression of the genes involved and leading to a range of phenotypes.
Analyze the given statements: The correct statement about continuous phenotypic variation is that it is typically influenced by multiple genes and environmental factors, as opposed to being the result of a single gene or unaffected by the environment.
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