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Deoxyribonucleic Acid, the molecule that carries genetic instructions for the development, functioning, and reproduction of all known living organisms.

A segment of DNA that is responsible for the physical and inheritable characteristics or phenotype of an organism.

A type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus.

Messenger RNA, a type of RNA that carries genetic information from the DNA to the ribosome, where it specifies the amino acid sequence.

One of two or more alternative forms of a gene that are found at the same place on a chromosome.

A change in the DNA sequence that can lead to a change in the gene product.

Transfer RNA, a type of RNA that carries amino acids to the ribosome for incorporation into a protein.

The study of changes in organisms caused by modification of gene expression rather than alteration of the genetic code itself.

The process by which a double-stranded DNA molecule is copied to produce two identical DNA molecules.

Ribosomal RNA, a molecular component of a ribosome, the cell's essential protein factory.

The tendency of DNA sequences that are close together on a chromosome to be inherited together during the meiosis phase of sexual reproduction.

A mechanism of evolution in which allele frequencies of a population change over generations due to chance (sampling error).

The process in which a segment of DNA is copied into RNA by the enzyme RNA polymerase.

A type of cell division that reduces the chromosome number by half, resulting in the production of haploid gametes or spores.

A diagram used to predict the outcome of a particular cross or breeding experiment.

An allele that only expresses its phenotypic effect when homozygous; its effect is masked by a dominant allele.

A sequence of three nucleotides that together form a unit of genetic code in a DNA or RNA molecule.

A non-Mendelian form of inheritance in which a trait is controlled by several genes at different loci.

The number, size, and shape of chromosomes in an organism.

Ribonucleic Acid, a molecule involved in protein synthesis and the transmission of genetic information.

The process in which ribosomes in a cell's cytoplasm create proteins, following transcription of DNA to RNA in the cell nucleus.

The set of rules by which information encoded in genetic material (DNA or RNA sequences) is translated into proteins.

A long DNA molecule with part or all of the genetic material of an organism. Humans have 23 pairs.

The genetic makeup of an organism; the combination of alleles for a given gene.

The physical appearance or biochemical characteristic of an organism as a result of the interaction of its genotype and the environment.

Having two different alleles for a particular gene.

The basic building block of DNA and RNA, consisting of a base, a molecule of sugar, and one phosphate group.

The theory that genetic information flows from DNA to RNA to Protein, but not in reverse.

An allele that expresses its phenotypic effect even when heterozygous with a recessive allele; if present, it determines the phenotype.