In situ conservation of farm animal genetic diversity
In AnGR: All measures to maintain live animal breeding populations, including those involved in active breeding programmes in the agroecosystem where they either developed or are now normally found, together with husbandry activities that are undertaken to ensure the continued contribution of these resources to sustainable food and agricultural production, now and in the future. (Source: FAO, 1999)

Integrating vector
A vector that is designed to integrate cloned DNA into the host cell chromosomal DNA.

Integration
The recombination process which inserts a small DNA molecule (usually by homologous recombination) into a larger one. If the molecules are circular, integration involves only a single crossing over; if linear, then two crossings over are required. A well known example is the integration of phage 1 (lambda) DNA into the E. coli genome

Interaction
In statistics, an effect that cannot be explained by the additive action of contributing factors; a departure from strict additivity.

Intercalary
(L. intercalare, to insert) Meristematic tissue or growth not restricted to the apex of an organ, i.e., growth at nodes.

Intercalary growth
A pattern of stem elongation typical of grasses. Elongation proceeds from the lower internodes to the upper internodes through the differentiation of meristematic tissue at the base of each internode.