Biology
- Mitosis
Prophase Chromatin condenses to form chromosomes. Centrioles migrate to opposite poles of the cells (except in plant cells which do not have centrioles). Microtubules develop and form a star shaped structure known as an aster, and spindle fibres may develop....
- # 30 Mitosis
Mitosis is a nuclear division giving rise to genetically identical cells in which the chromosome number is maintained by the exact duplication of chromosome. Significance of mitosis production of geneticlly identical cells: It keeps the chromosome...
- # 29 Dna Structure
In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure....
- # 28.2 The Mitotic Cell Cycle - Syllabus 2016
5.1 Replication and division of nuclei and cells 5.2 Chromosome behaviour in mitosis When body cells reach a certain size they divide into two. Nuclear division occurs first, followed by division of the cytoplasm. The mitotic...
- Metacentric
Term: metacentricLiterally meaning: ?after center?Origin: Anc Greek????/meta(after, next to)??????/centro/(center) > ??????/centri(=sting of a wasp)> ????????/centrizo(=stitch)Coined/History(?)Definition(biology) Metacentric is the chromosome with...
Biology
centromere
Term: centromere
Origin: Anc Greek
??????/centro/(center) > ??????/centri(=sting of a wasp)> ????????/centrizo(=stitch)
?????/meros (=part)
Coined:
 |
| Cyril Dean Darlington (1901-1981) |
The term introduced in 1936 by English biologist and geneticist Cyril Dean Darlington for the specialized chromosome region which reacts to the spindle at nuclear division and to which spindle fibers attach during cell division. Darlington studied chromosome segregation working on different plant species trying to understand why meiosis happened. Definition:
Centromere is a region that joins the two identical sister chromatids of a chromososme .
Comment
Centromere and kinetochore where considered synonyms until 1981. In 1981 Ris and Witt defined the term ?kinetochore? as the precise region on the chromososme that becomes attached to spindle and it is visible only in ultra-thin electron microscope sections. Centromere is the chromosomal region with which the kinetochore is associated (Rieder 1982).
Sourse
Emilio Battaglia. Centrmere, kinetochore, kinochore, kinetosome, kinosome, kinetomere, kinomere, kinetocentre, kinocentre: history, etymology and interpretation. Caryologia, Vol 56, no 1:1-21, 2003
- Mitosis
Prophase Chromatin condenses to form chromosomes. Centrioles migrate to opposite poles of the cells (except in plant cells which do not have centrioles). Microtubules develop and form a star shaped structure known as an aster, and spindle fibres may develop....
- # 30 Mitosis
Mitosis is a nuclear division giving rise to genetically identical cells in which the chromosome number is maintained by the exact duplication of chromosome. Significance of mitosis production of geneticlly identical cells: It keeps the chromosome...
- # 29 Dna Structure
In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure....
- # 28.2 The Mitotic Cell Cycle - Syllabus 2016
5.1 Replication and division of nuclei and cells 5.2 Chromosome behaviour in mitosis When body cells reach a certain size they divide into two. Nuclear division occurs first, followed by division of the cytoplasm. The mitotic...
- Metacentric
Term: metacentricLiterally meaning: ?after center?Origin: Anc Greek????/meta(after, next to)??????/centro/(center) > ??????/centri(=sting of a wasp)> ????????/centrizo(=stitch)Coined/History(?)Definition(biology) Metacentric is the chromosome with...