The manner in which genes and traits are passed from parents to their children. The four modes of Mendelian inheritance are autosomal dominant, autosomal recessive, X-linked dominant and X-linked recessive.
The term “mendelian” refers to the great Austrian biologist Gregor Mendel (1822-84) who formulated the laws forming the foundation of classical genetics. Mendel was a monk whose controlled experiments with breeding peas in the monastery garden led him to conclude that the heritable units we now call genes were not blends of parental traits but separate physical entities passed individually in specific proportions from one generation to the next. Mendel’s discoveries were ignored for several decades, but other biologists finally recognized their significance early in the 20th century.
- Intracytoplasmic sperm injection (ICSI)
A test-tube fertilization procedure in which a sperm is injected directly into an egg to achieve fertilization. ICSI is done for male infertility. Babies conceived by ICSI have no more major birth defects or delays in development than children conceived by natural means.
In the skin. For example, an intradermal injection is given into the skin. Abbreviated ID.
- Intradiskal electrothermal therapy
A procedure designed to relieve back pain due to damage to the disks between the spine bones. Called IDET for short. Under local anesthesia and X-ray guidance, a needle is introduced into the disk and a catheter with a heating coil is inserted through the needle. The tip of the catheter is then gradually heated […]
- Intraductal carcinoma
A condition characterized by the proliferation of malignant cells in the lining of a breast duct without evidence of spreading outside the duct to other tissues in the breast or outside the breast. Also known as ductal carcinoma in situ, abbreviated DCIS. DCIS is clearly a precursor (forerunner) of invasive breast ‘cancer. DCIS originates in […]
- Intraductal papilloma
A benign, wart-like growth that occurs in breast ducts.