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What is an observable feature of an organism called?
The term “phenotype” refers to the observable physical properties of an organism; these include the organism’s appearance, development, and behavior. An organism’s phenotype is determined by its genotype, which is the set of genes the organism carries, as well as by environmental influences upon these genes.
What is the observable product of a gene?
Definitions: phenotype is the constellation of observable traits; genotype is the genetic endowment of the individual. Phenotype = genotype + development (in a given environment).
What are the genes of an organism called?
A genome is the complete set of genetic information in an organism. It provides all of the information the organism requires to function. In living organisms, the genome is stored in long molecules of DNA called chromosomes.
What is expressivity and penetrance?
Penetrance is used to describe whether or not there is a clinical expression of the genotype in the individual. Expressivity is the term that describes the differences observed in the clinical phenotype between two individuals with the same genotype.
What types of genes are constitutively expressed?
Constitutive genes are those that are always active. Genes for ribosomes are an example. They are constantly being transcribed because ribosomes are constantly needed for protein synthesis. Inducible genes are those that have variable activity, depending on the needs of the cell.
What is expressivity in biology?
In genetics, expressivity is the degree to which a phenotype is expressed by individuals having a particular genotype. (Alternately, it may refer to the expression of particular gene by individuals having a certain phenotype.)
What does variably expressed mean?
Listen to pronunciation. (VAYR-ee-uh-bul ek-SPREH-shun) Variation in the manner in which a trait is manifested. When there is variable expressivity, the trait may vary in clinical expression from mild to severe.