Exogenote
Chromosomal fragment homologous to an endogenote and donated to a merozygote.

Exogenous
(Gr. exe, out, beyond + genos, race, kind) Produced outside of, originating from, or due to external causes. Opposite of endogenous.

Exon
1. A segment of a-eukaryotic gene that is transcribed as part of the primary transcript and is retained, after processing, with other exons to form a functional mRNA molecule. See DNA; intron; split gene; splicing.

2. Those portions of a genomic DNA sequence which WILL be represented in the final, mature mRNA. The term exon can also be used for the equivalent segments in the final RNA. Exons may include coding sequences, the 5 untranslated region or the 3' untranslated region
Exon amplification
A procedure that is used to amplify exons.

Exotoxin
A toxin released by a bacterium into the medium in which it grow
Expected progeny difference (EPD)
The predicted performance of the future offspring of an animal for a particular trait, calculated from measurement(s) of the animal's own performance and/or the performance of one or more of its relatives, for the trait in question and/or for one or more correlated traits. Typically, the prediction is expressed as a deviation from a well-defined base population, assuming the animal in question is mated to a sample of animals whose average genetic merit equals that of the base population. The predicted performance of the offspring of the mating between any two animals is the sum of their EPDs.