Variation and Mutation

Phenotypic Expression

Contributors
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Ben Whitten

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What is a phenotype?
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A phenotype is an observable trait produced by the actions of one or more gene-encoded proteins. The phenotype is influenced by the genotype and the effects of the environment


For example, the genotype for a flower may be RR (where red is R and white is r), meaning the flower presents as being fully red as the R allele is dominant. In terms of genotype, it is the genetic composition of an organism for a particular trait (set of alleles).

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What is a gene and its relatedness to phenotype?
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A gene carries a particular set of instructions for how a protein is to be made; when the gene is read, transcribed and translated into a protein, the gene is said to be expressed. The protein has specific functions dependent on the gene. The protein can be categorised as either a structural protein or an enzyme. By coding for proteins, genes determine important facets of biological structure and function. The observable traits are known as the phenotype.

Topic Menu
Causes of Mutations
Chromosomal Mutations
Point Mutations
Effects of Mutations
Sexual Reproduction and Variation
Phenotypic Expression
Environmental Factors
Variation

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