top of page

Variation and Mutation

Phenotypic Expression

Topic Menu
Content Contributors
Christian Bien Portrait_edited.jpg

Ben Whitten

Learning Objectives

tutorial.png

one.png
What is a phenotype?
Slide1.jpeg

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).

two.png
What is a gene and its relatedness to phenotype?
Slide2.jpeg

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 depending 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.

two.png
Slide2.jpeg
two.png
Slide2.jpeg
two.png
Slide2.jpeg
two.png
Slide2.jpeg
two.png
Slide2.jpeg
two.png
Slide2.jpeg

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). 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 depending 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.

Causes of Mutations
Chromosomal Mutations
Point Mutations
Effects of Mutations
Sexual Reproduction and Variation
Phenotypic Expression
Environmental Factors
Variation
bottom of page