Dictionary > Metacentric chromosome

Metacentric chromosome

Definition
noun, plural: metacentric chromosomes
A chromosome in which the centromere is located in the middle resulting in chromosomal arms that are almost equal in length
Supplement
The centromere is the dense, constricted region in a chromosome. It contains highly-specialized repetitive DNA sequences (e.g. satellite DNA) that are packaged into heterochromatin. The centromere serves as the site for kinetochore assembly and therefore it is essential during the alignment of the chromosomes at the metaphase plate and the subsequent segregation of chromosomes during cellular division. The presence of the centromere results in the characterization of the chromosomal arms. The arm that is relatively shorter is called p whereas the one that is longer is called q. Based on the position of the centromere, the chromosome may be described as metacentric, submetacentric, acrocentric, telocentric, subtelocentric, and holocentric.
A metacentric chromosome is a chromosome whose centromere is centrally located. As a result, the chromosomal arms (i.e. p and q arms) are almost equal in length. A metacentric chromosome would have the X shape. A chromosome with slightly unequal chromosomal arm length is referred to as submetacentric chromosome.
In humans, chromosomes that are metacentric include chromosome 1, chromosome 3, chromosome 16, chromosome 19, and chromosome 20.
See also:


You will also like...

squirrel
Animal Water Regulation

Animals adapt to their environment in aspects of anatomy, physiology, and behavior. This tutorial will help you understa..

Peppered moth ("Biston betularia") melanic and light form
Examples of Natural Selection

Darwin's Finches are an example of natural selection in action. They are an excellent example of the way species' gene p..

Growth Patterns
Growth Patterns

This tutorial describes the sigmoid curve, annual plant growth, tree growth, human growth, and insect growth as the grow..

Kidneys
Kidneys and Regulation of Water and Inorganic Ions

The kidneys are responsible for the regulation of water and inorganic ions. Read this tutorial to learn about the differ..

Plant Water Regulation
Plant Water Regulation

Plants need to regulate water in order to stay upright and structurally stable. Find out the different evolutionary adap..

Non-Mendelian Inheritance
Non-Mendelian Inheritance

In this tutorial, find out more about certain types of inheritance that does not follow the Mendelian inheritance patter..

Related Articles...

No related articles found

See all Related Topics