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I

Identical twin
Twins produced by the division of a single zygote; both have identical genotypes.
See also: fraternal twin

Immunotherapy
Using the immune system to treat disease, for example, in the development of vaccines. May also refer to the therapy of diseases caused by the immune system.
See also: cancer

Imprinting
A phenomenon in which the disease phenotype depends on which parent passed on the disease gene. For instance, both Prader-Willi and Angelman syndromes are inherited when the same part of chromosome 15 is missing. When the father's complement of 15 is missing, the child has Prader-Willi, but when the mother's complement of 15 is missing, the child has Angelman syndrome.

In situ hybridization
Use of a DNA or RNA probe to detect the presence of the complementary DNA sequence in cloned bacterial or cultured eukaryotic cells.

In vitro
Studies performed outside a living organism such as in a laboratory.

In vivo
Studies carried out in living organisms.

Independent assortment
During meiosis each of the two copies of a gene is distributed to the germ cells independently of the distribution of other genes.
See also: linkage

Informatics
See: bioinformatics

Informed consent
An individual willingly agrees to participate in an activity after first being advised of the risks and benefits.
See also: privacy

Inherit
In genetics, to receive genetic material from parents through biological processes.

Inherited
See: inherit

Insertion
A chromosome abnormality in which a piece of DNA is incorporated into a gene and thereby disrupts the gene's normal function.
See also: chromosome, DNA, gene, mutation

Insertional mutation
See: insertion

Intellectual property rights
Patents, copyrights, and trademarks.
See also: patent

Interference
One crossover event inhibits the chances of another crossover event. Also known as positive interference. Negative interference increases the chance of a second crossover.
See also: crossing over

Interphase
The period in the cell cycle when DNA is replicated in the nucleus; followed by mitosis.

Intron
DNA sequence that interrupts the protein-coding sequence of a gene; an intron is transcribed into RNA but is cut out of the message before it is translated into protein.
See also: exon

Isoenzyme
An enzyme performing the same function as another enzyme but having a different set of amino acids. The two enzymes may function at different speeds.


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