A Primary Key from One File and a Foreign Key

question 117

True/False

A primary key from one file and a foreign key from another file are used to create a relationship between two files in a relational database.

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Definitions:

Allele Frequency

Allele frequency refers to how common an allele is in a population, expressed as a proportion or percentage of all alleles for a given gene in the population.

Stabilizing Selection

Natural selection that acts against extreme phenotypes and favors intermediate variants; associated with a population well adapted to its environment. Compare with directional selection and disruptive selection.

Natural Selection

The process by which individuals with traits better suited to their environment are more likely to survive and reproduce, driving the evolution of species.

Population

A collection of the same species individuals who live in a specified area and breed among themselves.