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....
- Q: Compare And Contrast The Prokaryotic And Eukaryotic Genomes
The eukaryotic genome is diploid but the prokaryotic genome is haploid. The eukaryotic genome has multiple origins of replication but the prokaryotic genome has only one origin of replication. The eukaryotic genome may have more than one chromosome but...
- # 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....
- Myotonia, Myotonic (adj)
Term: myotoniaOrigin: Anc Greek???/mys/ (=muscle) > ???/myo(=enclosed like the muscle inside body or rat in its nest=epimys)?????/tonos (= the normal state of elastic tension or partial contraction in resting muscles)> ?????/taneo(=strain)myotonia...
Biology
kinetochore
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Term: kinetochore
Origin: Anc Greek
???????/kinisis/(=movement) >
?????/choros (=place, region)
Coined:
The term introduced in 1934 by L.W. Sharp in his well-known text book (cf.chapter F, Introduction to Cytology) two years earlier than centromere was recommended by Cyril Dean Darlington (1936)
Definition:
Definition:
Kinetochore is the precise region that joins the two identical sister chromatids of a chromosome within centromere.
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....
- Q: Compare And Contrast The Prokaryotic And Eukaryotic Genomes
The eukaryotic genome is diploid but the prokaryotic genome is haploid. The eukaryotic genome has multiple origins of replication but the prokaryotic genome has only one origin of replication. The eukaryotic genome may have more than one chromosome but...
- # 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....
- Myotonia, Myotonic (adj)
Term: myotoniaOrigin: Anc Greek???/mys/ (=muscle) > ???/myo(=enclosed like the muscle inside body or rat in its nest=epimys)?????/tonos (= the normal state of elastic tension or partial contraction in resting muscles)> ?????/taneo(=strain)myotonia...