Multiple Choice
A phenotype is controlled by gene A and gene B. Gene B controls the expression of gene A. This is an example of _____.
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13. Mendelian Genetics
Non-Mendelian Genetics
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A single genetic locus that controls more than one trait is said to be __________.
A
polygenic
B
epistatic
C
a quantitative character
D
somatic
E
pleiotropic
Verified step by step guidance1
Understand the concept of a genetic locus: A genetic locus is a specific, fixed position on a chromosome where a particular gene or genetic marker is located.
Identify the term 'pleiotropic': Pleiotropy occurs when one gene influences multiple phenotypic traits. This is because the gene product may be involved in multiple biological pathways or processes.
Differentiate between the given options: 'Polygenic' refers to a trait controlled by multiple genes, 'epistatic' involves interaction between genes where one gene masks or interferes with the expression of another, 'a quantitative character' refers to traits that are measured on a continuous scale and are usually influenced by multiple genes, and 'somatic' refers to cells of the body excluding germ cells.
Recognize that the question asks for a single genetic locus affecting multiple traits, which aligns with the definition of pleiotropy.
Conclude that the correct term for a single genetic locus controlling more than one trait is 'pleiotropic'.
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