Glossary

BioScience.com.pk try the best to avoid the use of medical terms that could make it more difficult to understand the information on this website. Still, there are a number of terms that can’t be avoided and that are useful to know because they are so often used by the doctors, nurses, and other medical professionals with whom you might speak. The list below includes the terms used on BioScience.com.pk for which we have provided definitions.

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Term Definition
XXY disease

Also known as: XXY disease

A rare genetic condition in boys and men caused by an extra X chromosome. (Males normally have one X and one Y chromosome.) The presence of the extra X chromosome may or may not produce obvious signs and symptoms (usually in teens and adults), such as low testosterone, small penis and testicles, enlarged breasts, tall stature and/or behavioral, learning, speech or language disabilities. Most of these individuals are infertile.
X-linked trait

A genetic trait found on the X chromosome; women have two copies of this chromosome, while men have only one.
X-linked recessive trait

A genetic trait that is apparent when all copies of the X-chromosome possess the gene; in men, this occurs when they inherit the trait from their mother, while women must inherit the trait from both parents. For this reason, X-linked recessive traits are almost always apparent only in men, while women are more commonly carriers of the trait.