Science / Genetics / Polymorphism: Difference in dna sequence among individuals that may underlie differences in health. Genetic variations occurring in more than 1% of a population would be considered useful polymorphisms for genetic linkage analysis.

Single Nucleotide Polymorphism (SNP)

Science / Genetics / Single Nucleotide Polymorphism (SNP): Dna sequence variations that occur when a single nucleotide (a, t, c, or g) in the genome sequence is altered. MORE

Genetic Polymorphism

Science / Genetics / Genetic Polymorphism: Difference in dna sequence among individuals, groups, or populations (e.g., genes for blue eyes versus brown eyes). MORE

Restriction Fragment Length Polymorphism (RFLP)

Science / Biology / Restriction Fragment Length Polymorphism (RFLP): A heritable difference in DNA fragment length and fragment number; passed from generation to generation in a codominant way. MORE

Protein Polymorphism

Science / Marine Biology / Protein Polymorphism: Presence of several variants of a protein of a given type (e.g., a certain enzyme, such as carboxylase) in a population MORE


Science / Biology / Mutation: Any heritable change in the nucleotide sequence of DNA; can involve substitutions, insertions, or deletions of one or more nucleotides. MORE