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Which is not a feature of a multifactorial trait?
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13. Mendelian Genetics
Non-Mendelian Genetics
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Height is a polygenic trait. What does this mean?
A
It is influenced by environmental factors only.
B
It is determined by a single gene with multiple alleles.
C
It is inherited through mitochondrial DNA.
D
It is controlled by multiple genes, each contributing to the phenotype.
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Understand the term 'polygenic trait': A polygenic trait is one that is controlled by two or more genes, often located on different chromosomes. Each of these genes contributes to the overall phenotype in a cumulative or additive manner.
Recognize that polygenic traits often show a continuous distribution of phenotypes, such as height, skin color, or weight, rather than discrete categories.
Consider the role of multiple genes: In the case of height, multiple genes contribute to the final height of an individual. Each gene may have a small effect, but together they produce a wide range of possible heights.
Differentiate from other genetic influences: Unlike traits controlled by a single gene with multiple alleles or those inherited through mitochondrial DNA, polygenic traits involve the interaction of several genes.
Acknowledge environmental factors: While polygenic traits are primarily controlled by multiple genes, environmental factors can also influence the expression of these traits, adding to the variability seen in the population.
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