Multiple Choice
Which of the following best explains why the relationship between genes and traits is often complicated in humans, particularly in the context of variations of dominance?
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3. Extensions to Mendelian Inheritance
Variations of Dominance
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A trait that exhibits continuous variation (such as human height) is called a(n) ______ trait.
A
quantitative
B
monogenic
C
recessive
D
dominant
Verified step by step guidance1
Understand the difference between types of traits: monogenic traits are controlled by a single gene, while quantitative traits are influenced by multiple genes and often environmental factors.
Recognize that continuous variation means the trait shows a range of phenotypes rather than discrete categories, which is typical of traits like human height.
Recall that traits showing continuous variation are called quantitative traits because their expression can be measured on a scale and is usually controlled by many genes (polygenic inheritance).
Eliminate options that do not fit: monogenic refers to single-gene traits, recessive and dominant describe inheritance patterns but do not explain continuous variation.
Conclude that the correct term for a trait with continuous variation, such as human height, is a quantitative trait.
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