Recessive, X-linked
A gene on the X chromosome that expresses itself only when there is no different gene present at that locus (spot on the chromosome). For example, Duchenne muscular dystrophy (DMD) is an X-linked recessive disorder. A DMD boy has the DMD gene on his sole X chromosome (and so is said to be hemizygous for DMD). Some girls who are heterozygotes for DMD can have DMD features in older age .
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- Recipient
In medicine, someone who is given something, such as a blood transfusion or an organ transplant, that is derived from another person (the donor).
- Recombinant
A person with a new combination of genes, a combination not present in either parent, due to parental recombination of those genes.
- Reciprocal translocation
A type of chromosome rearrangement involving the exchange of chromosome segments between two chromosomes that do not belong to the same pair of chromosomes. A specific reciprocal translocation might, for example, involve the swap of material between chromosomes 1 and 19.
- Recombinant clones
Clones containing recombinant DNA molecules.
- Recombinant DNA Advisory Committee (RAC)
The National Institutes of Health (NIH) panel that oversees gene-therapy research in the U.S.