Select Page

Archives: Dictionary


Noun 1. The destructive fragmentation of the nucleus of a dying cell whereby its chromatin is distributed irregularly throughout the cytoplasm. It is usually preceded by pyknosis and is followed by karyolysis and can occur as a result of either programmed cell death or necrosis. ( 2. Fragmentation of the nucleus whereby its chromatin is distributed irregularly throughout the cytoplasm; a stage of necrosis usually followed by karyolysis. ( 3. Degeneration of the nucleus of a cell. There is contraction of the chromatin into small pieces, with obliteration of the nuclear boundary. ( Word origin: From Greek karyon “nut, kernel” + rhexis,...

Read More


/ˈkarēəˌtīp/ Noun, pl. karyotypes 1. The number and appearance of chromosomes in the nucleus of a eukaryotic cell. The term is also used for the complete set of chromosomes in a species, or an individual organism. ( 2. The observed characteristics (number, type, shape etc) of the chromosomes of an individual or species. ( 3. A record of such characteristics, usually photographic. ( 4. The chromosome characteristics of an individual cell or of a cell line arranged in descending order of size and according to the position of the centromere. Usually presented as a systematized array of metaphase chromosomes from a photomicrograph of a single cell nucleus. ( 5. The appearance of the chromosomal makeup of a somatic cell in an individual or species (including the number and arrangement and size and structure of the chromosomes). ( 6. The number and visual appearance of the chromosomes in the cell nuclei of an organism or species. (Google Dictionary) Word origin: From Greek karyon “nut, kernel,” + from Latin typus “figure, image, form, kind,” from Greek typos “dent, impression, mark, figure, original form,” from root of typtein “to strike,...

Read More
  • 1
  • 2

Struggling in Biology?

Are You Premed?

Confused about the MCAT? Not sure how to prepare? This guide will show you how