Multiple Choice
Which term best describes the situation when an allele has no noticeable effect on an organism's phenotype?
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3. Extensions to Mendelian Inheritance
Variations of Dominance
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Which genetic phenomenon is described when one gene has several different forms, resulting in more than two phenotypes?
A
Incomplete dominance
B
Multiple alleles
C
Codominance
D
Epistasis
Verified step by step guidance1
Understand the concept of alleles: Alleles are different versions or forms of a gene that can exist at a specific locus on a chromosome.
Recognize that when a gene has more than two alleles in a population, this is called 'multiple alleles.' This means there are several different forms of the same gene, not just two.
Differentiate multiple alleles from incomplete dominance and codominance: Incomplete dominance involves two alleles producing an intermediate phenotype, while codominance involves both alleles being fully expressed together.
Note that epistasis refers to the interaction between different genes, where one gene affects the expression of another, rather than multiple forms of a single gene.
Conclude that the genetic phenomenon where one gene has several different forms, resulting in more than two phenotypes, is best described as 'multiple alleles.'
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